1. Daikin Altherma LT-CB
7. Troubleshooting

2. 7. Troubleshooting
Use of service manual (retrieve error codes, repair)
Service tools
D-checker
Configurator
Inverter analyser
Other service tools
Common mistakes
Contact

3. 7.1. Use of service manual (retrieve error codes, repair)
New style service manual for first line engineer
Introduction (general operation of the unit + how to use this book)
Troubleshooting
How to retrieve error codes
Error code based troubleshooting
Symptom based troubleshooting
Component checklist
Repair
General repair procedures
Unit specific procedures (parts replacement)
Maintenance
In 2013, a project group was set up to re-evaluate the content and lay-out of the Daikin Service Manual.
Conclusion was that it was too big, contained too much information, was not straight-forward and hence made it very difficult for the installer to use.
The new style service manual is a service manual which is developed for the first line engineer to assist him during the first troubleshooting.
It contains 4 basic chapters and is equipped with lots of pictures and hyperlinks to make troubleshooting & repair very quick and easy.
It contains a chapter Introduction, with the usual safety instructions and guidelines but also a brief explanation on general operation of the unit (for those who have never been confronted with a Daikin Altherma LT-CB unit before) and a “how to use this book” as a quick-guide.
If you have the digital version of the book, you can use the hyperlinks for quick manoeuvring through the different chapters, which will make using it very easy.
The troubleshooting chapter is also very straight forward. It instructs you how to obtain the error code and then through the hyperlinks, you immediately head for the error on display, and from there to the detailed check-procedure of the component & eventual repair instruction.
This chapter also helps you to find the cause of the problem in case there is no error displayed. For this, the chapter on ‘symptom based troubleshooting’ might help you.
You will find the Component checklist and Repair procedure very easy to work with as it always contains full color pictures, references to location in wiring diagram and unit, as well as detailed pictures with step by step approach.
We advise to have this book with you digitally or printed version whenever you go out for troubleshooting Daikin Altherma LT-CB.
Then, should you still not manage to solve the problem with the help of this book, on the last page, you find an instruction sheet on which information you should gather before contacting your affiliate in order to make sure that they can help you as quick as possible.

4. 7.1. Use of service manual retrieve error codes
Error: system stops & code will be displayed on the user interface screen (ex. U4 error)
Warning, no system stop but the i-symbol (information) will be blinking and you can see the warning code by pressing the i-button (ex. AH warning)
Error
Mon 15:20
Room
Leaving water temperature sensor problem.
Please contact your dealer.
In most cases, if there is something wrong with the unit, it will communicate a troubleshooting code.
For LT-CB, there are 3 types of troubleshooting code:
Error: a severe problem, system will preventively shut down to prevent further breakdown
Warning: not a severe problem but the installer should be notified
Caution: not a severe problem but a sort of alert that the unit will start monitoring a certain event, which might over time result in an error or a warning.
For LT-CA, they were all displayed in the error code history list on the enduser level, which often created confusion for the enduser. Now, for LT-CB, it was decided to only display the history list in the installer level and split up in 2 lists, one for errors and one for warnings. The enduser will only be able to see the history list at the moment the error occurs, so he can inform the installer on the telephone about the problem that is currently occurring.
Once you retrieved the error code/warning code, you can further lookup what it means in the service manual.
Actual temperature
Caution, no system stop and nothing is visible on user interface. Cautions are stored in a history list which can only be consulted when in Installer level, to avoid confusion by enduser. (ex. A5 caution)

5. 7.1. Use of service manual
to solve error codes
Step 1: Check the corresponding error or cause in the service manual
Leaving water thermistor R1T abnormality
Trigger
Effect
Reset
Thermistor detects an abnormal value (open/short circuit
Unit will stop operating.
Auto-reset when problem is solved.
Once you found the error code, you can find the meaning in the service manual. For every code, you will find the trigger, effect and reset procedure, followed by a list of possible causes with every time the link to the check procedure and corrective action.
With the hyperlinks you can quickly navigate to the correct page.
Possible cause
Check
Corrective action
Faulty leaving water thermistor R1T/hydro PCB A1P)
Check thermistor R1T (see page 57)
Replace thermistor R1T (see page 141) or hydro PCB (see page 91)

6. 7.1. Use of service manual
to solve error codes
Step 2: Perform troubleshooting (hyperlinks)
Check parts (procedure in service manual)
Repair (repair procedures in service manual)
These extracts show you how well the check & repair procedures are documented in the new service manual. It’s a step by step approach which should make it very easy for every installer to get the unit back to work as soon as possible and without frustrations.
On the left side you see where the part is located in the wiring diagram, in the switchbox and where exactly inside the unit.
Repair instructions show you a 3D cut out view of the inside of the unit to allow a good insight on how to access the part that needs replacement.

7. 7.2. Service tools: D-Checker
WHY?
D-Checker is a service tool to read out & record operating parameters from below units:
(multi)Split
Sky-air
ZEAS
Convenipack: AC17 model
R410a Booster
Daikin Altherma LT (small OU & big OU), Hybrid & GSHP
In case no error code is shown, some more advanced troubleshooting on the unit can be done with the D-checker tool.
With the help of a cable & a laptop, you will be able to read out operating parameters & do a recording in case the phenomena happens over time. Purpose of the tool is to assist the installer and allow him to do diagnosis of the strange behaviour of the unit.

8. 7.2. Service tools: D-Checker
WHAT?
! Use the connector that matches the unit you’ll be using it on: .
5-pin connector to connect to outdoor unit (multi-split, sky-air) or indoor (Daikin Altherma LT-C*)
7-pin connector to connect to split outdoor unit
Additional adapter cable to connect to Daikin Altherma LT-B* indoor unit
Partnumber P
The cable can be ordered through Daikin.
Latest software is freely available on Extranet.
USB-A/B to provide power
Partnumber
999491P
Software can be found on Extranet 8

9. 7.2. Service tools: D-Checker
HOW?
D - Checker
Make sure you connect the cable to the correct connector X10A on the hydro pcb of the Daikin altherma LT-C*.
5-pin connector Daikin Altherma LT-C*
Daikin Altherma LT-C* indoor unit connector X10A
Communication + power USB

10. 7.2. Service tools: D-Checker
HOW? 1 2 3 4
When the cables are connected, you can start the D-Checker software on your computer
First you see the D-Checker Main Menu, which shows you following options:
Button 1: « Record » (F1) : allows you to start a recording
Button 2: « Play » (F2) : allows you to check an existing recording
Button 3: « Data transfer » (F3) : allows you to transfer your recording to another file
Button 4: « Customer info » (F4) : allows you to enter or modify information on a client recording
Button 5: « Option » (F5) : allows you to configure the COM port as well as some read-out parameters (°C, bar, ..)
Button 6: « End » (F12) : To exit the D-Checker Main Menu 5 6

11. 7.2. Service tools: D-Checker
HOW?
Start a recording:
Add a new customer and save:
Next slides show how to start a recording of D-checker version v2.18, step by step.
On the extranet, you can also find an instruction manual.

12. 7.2. Service tools: D-Checker
HOW?
Select a new map Connect to the Altherma through ‘Indoor (F5)’ - button
When connecting the altherma to split or sky-air, you can make connection by pressing the ‘auto select’ button.
However, for Altherma, we connect the D-checker to the indoor unit so you have to make connection by pressing the ‘indoor’ button.

13. 7.2. Service tools: D-Checker
HOW?
Once you made connection with the unit, a unique Map Name is created. It is now important that you load the correct datalabel to have appropriate data read-out. Not doing so will give you dummy parameters in the recording.
For Daikin Altherma LT-C*, always connect through the ‘Indoor’ button and don’t forget, after connection was made, to select the correct datalabel.
Not selecting a datalabel or selecting the wrong datalabel, will give you strange parameters like dummies. With the correct datalabel, the data for that specific unit is loaded and you will get indication of the exact sensor name.

14. 7.2. Service tools: D-Checker
HOW?
Start/End the recording through ‘Record Mode (F2)’. Then consult your recording in ‘Display Model (F3)’

15. 7.2. Service tools: D-Checker
HOW?
To see the recording data, click on « Display Mode » (F3).
The operating data can be viewed under 3 different ways:
All operating data: « Operation data-All ».
A selection of the operating data: « Operation data- Selected ».
A graphical display of some operating data:« Graph display » (only the items which you marked with a star or a cross are displayed).

16. 7.2. Service tools: Daikin Configurator
WHY?
It’s a commissioning & service tool for Altherma LT-C*, GSHP, Hybrid & VRV IV.
Helps you to set the correct fieldsettings on a unit
Can be used to upload same settings to several houses (building project)
Allows to change the language of the controller
Can download and export all fieldsettings to a csv/excel file (overview)
Can help you check which settings were changed from default (for troubleshooting)
The Daikin Configurator was developed to help the installer select the correct fieldsettings for the unit.

17. 7.2. Service tools: Daikin Configurator
WHAT?
5-pin connector to connect to indoor PCB (Daikin Altherma LT-C*)
EKPCCAB
The cable can be ordered through Daikin and the latest software version that goes with it is always available
on the website for free.
On this website, you can also find the instruction manual in local language.
Make sure you check to always have latest version available as we regularly update the version to ensure
compatibility with new models.
USB-A/B to provide power
Software and manual in local language can be found on 17

18. 7.2. Service tools: Daikin Configurator
HOW?
Configurator cable
Make sure you connect the cable to the correct connector X10A on the hydro pcb of the Daikin altherma LT-C*.
5-pin connector Daikin Altherma LT-C*
Daikin Altherma LT-C* indoor unit connector X10A
Communication + power USB

19. 7.2. Service tools: Daikin Configurator
HOW?
Instructions in local language can be found on internet:
If you go to the website daikineurope.com, and then click on ‘software downloads’, you will find the latest version of the software for the Configurator.
Make sure that at all times you have the latest software version to ensure maximum compatibility with new units. Administrator rights are not necessary.

20. 7.2. Service tools: Daikin Configurator
HOW?
For troubleshooting, it is always important to know all the fieldsettings. A download can be done with the Configurator.
The Configurator is mainly used as a ‘commissioning tool’ but also for service/troubleshooting, it is very valuable. As you might suspect, wrong settings may lead to incorrect operation of the unit. Therefore, upon every troubleshooting occasion, be sure to check if anything might be wrong with the fieldsettings. The Configurator makes it easy to make a download of all settings on the unit.

21. 7.2. Service tools: Daikin Configurator
HOW?
When troubleshooting, you can also quickly check which settings were changed from default (white box instead of blue box)
Due to the big offer of fieldsettings, you can really perform finetuning of the system.
However, we notice that 80% of the problems with the unit are caused by faulty system settings. So at all times, when performing troubleshooting, make sure to check if there was no wrong setting done in the fieldsettings.
Problems can be caused by:
enduser: maybe he didn’t understand the system operation well
Installer: due to wrong fieldsettings
Product quality
When performing troubleshooting, you have to check in that order because it is of no use replacing parts if the problem was caused by wrong fieldsettings or the enduser not understanding operation of the unit.

22. 7.2. Service tools: Inverter Analyzer
WHY? WHAT?
If abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether it is caused by the compressor failure or other failure (control pcb, power module, ..)  Inverter checker makes it possible to judge the cause of trouble. It checks whether the inverter signal is being sent from the inverter pcb to the compressor. partn°: (RSUK0917A)
The inverter analyzer can also be used on split, sky-air & VRV units. It’s a great tool to determine the cause in case of an inverter problem. Cost-wise, it’s interesting to know on beforehand whether replacement of the compressor is necessary or whether replacement of the inverter pcb might be more suitable to solve the problem.
The inverter analyzer can be ordered through Daikin.

23. 7.2. Service tools: Inverter Analyzer
HOW? – connect to unit
Turn the power off before connecting the inverter checker
Make sure the charged voltage of the built-in smoothing electronic capacitor drops to 10 VDC or below before carrying out the service work.
(1) Remove the faston terminals from the terminal block of the compressor.
(2) Connect the faston terminals to the terminals of the Inverter Analyzer.
These slides show you how to connect and use the inverter analyser.
Turn power off and then remove the faston terminals from the compressor. Connect them in the correct order to the inverter analyser.
Be careful that the terminals (U,V,W) don’t touch each other, high voltage is applied!

24. 7.2. Service tools: Inverter Analyzer
HOW? – Start the inverter test on small OU
! Unit needs to be started in TEST mode! (described in service manual) If not, during initialisation, the compressor will not be detected, hence the unit will give an error. In TEST mode, this ‘missing’ signal will be ignored for about 20 minutes.
How to start inverter test on small OU?
 Turn power back on and activate inverter test on service monitor pcb by pushing dipswitch SW1 for 5 seconds (selector SW2 can be set to either heat or cool)
It is very important when you perform a check with the inverter checker, to start the unit up in test mode.
During initialization, the unit will perform some checks. One of the checks is a feedback signal from the compressor. But when using the inverter checker, the compressor is disconnected.
If you start up in test mode, then the feedback signal from the compressor is ignored for some time.

25. 7.2. Service tools: Inverter Analyzer
Inverter analyzer HOW? – Start the inverter test on big OU
It is very important when you perform a check with the inverter checker, to start the unit up in test mode.
During initialization, the unit will perform some checks. One of the checks is a feedback signal from the compressor. But when using the inverter checker, the compressor is disconnected.
If you start up in test mode, then the feedback signal from the compressor is ignored for some time.

26. 7.2. Service tools: Inverter Analyzer
Inverter analyzer HOW? – Evaluate result & disconnect
If all 6 leds light up  problem is compressor related If not all 6 leds light up  problem is inverter pcb related To disconnect the Inverter Analyzer, power off the unit and wait a couple of minutes untill all the leds are off (unloading of the capacitors, 500VDC). Then disconnect the Inverter Analyzer and reconnect the compressor (correct connection of UVW!). Power ON the unit again.
Make sure to connect UVW in the correct order (according to the connection sticker on the compressor) to avoid reverse phase problems.

27. 7.2. Service tools: local service tools
Example from Extranet - marketing:
Apart from the traditional service tools, Daikin also offers other service tools like an App for your smartphone for finding more information about a certain error code.
Also check with your affiliate if they have some local apps or other service tools which they created.

28. 7.3. Common mistakes
Integrated indoor unit EHV*CB and reheat only DHW function
EHV*CB = tank without Booster heater!
DHW = hp + BUH (when necessary)
SPH = hp + BUH (when necessary)
BUH can not work in DHW & SPH simultaneously
DHW by reheat only is hence not recommended: too frequent BUH operation & risk of capacity shortage
Use DHW by “Scheduled + Reheat” or “Scheduled only”
Domestic hot water production for the integrated unit EHV*CB is done with the heatpump and assisted by the backup heater where necessary.
If also space heating is required, then the backup heater can only work either for DHW, either for SPH.
We strongly recommend to avoid the combination of the integrated indoor unit with the setting for DHW function ‘reheat only’.
Energy-wise and comfort wise, there are better solutions for preparing DHW when using the integrated indoor unit.
We also advise to select smart values for DHW setpoint. In the databook, operation range, you can see to what temperature the hot water can be prepared with the use of the heatpump only. If you select a higher setpoint, then the heater element will be required. It is then also important that you enabled the heater. If you disabled the heater, then the unit will ‘hang’ in DHW, trying to reach a high setpoint with the hp but being prevented from reaching it because the heater element is not allowed to help. You will get stuck in DHW cycle.

29. 7.3. Common mistakes Frequent AH warning
In case disinfection function is not executed correctly, AH warning will appear.
This means that the disinfection temperature was not kept for the required time within a certain timeframe.
This might happen if:
There was a large DHW tapping just before the start of the disinfection function (tank is very cold at start of disinfection function)
There was a large DHW tapping during disinfection function (tank is cooled down again during disinfection)
BUH or BSH is disabled by setting or not connected (these heaters are necessary to reach high disinfection temperature)
Fuse
In some countries, disinfection function is obligatory.
Explain what happens to the enduser & inform him about the consequences of interrupting the function.

30. 7.3. Common mistakes Unit behaves strange without error/warning
In case the unit shows strange behaviour, you can consult the chapter “Symptom based troubleshooting” in the Service Manual. There, it is described per phenomena, what might be the cause.
The new style service manual also contains a chapter for symptom based troubleshooting.
Depending on the phenomena that occurs and that you witness, we formulated some possible causes that should be checked in order to get the unit up and running again.

31. 7.3. Common mistakes Error codes
In case the unit indicates an error code, you can consult the chapter
“Error codes”
in the Service Manual.
There, it is described per phenomena, what the error means, with hyperlinks to the check procedure & replacement procedure.

32. 7.3. Common mistakes
Product combinations (indoor-outdoor-tank-accessories)
In case you want to know which products are combineable, you can always check the Sales documentation.
If you cannot find your combination in the combination table, it means it has not been tested and we cannot guarantee good operation.

33. 7.4. Contact Technical support: Spare Parts support Warranty support
Call: 00xx xxxxxxxxx
Spare Parts support
Warranty support
In case our documentation (training, installation manual, installer reference guide, databook, operation manual, service manual) could not help you, our staff is always available to further discuss the problem with you.
When contacting them, make sure you have enough details about the problem unit (modelname, serial number, fieldsettings, error code, problem description) so we can help you as good and quick as possible. Thank you for your efforts.

34. 7.4. Contact: required info before contacting
Full modelname
Software versions of user interface & hydro pcb
Download (configurator) of settings + schedules
Picture of nameplate
Serial number
Date of production
List of actions (history) that were already done by installer
Replacement of parts, software update, check of service manual, …
Troubleshoot request? D-checker data to verify your claim!
Additional data request? Reason why you need this data.