Daikin boilers are reliable units but can develop faults from time to time, just like any other brand of boilers. When something goes wrong with your Daikin boiler, an error code should appear on the display screen to inform you that your boiler requires some attention. The fault codes are supposed to make it easy for you and your heating engineer to identify problems and figure out what needs doing or fixing to put things right.
If your Daikin boiler shows an error code and you want to find out what it means, check out the list of fault codes and their possible causes and solutions in the table below.
Daikin Altherma 3 D2CND Combi Boiler Fault Codes
| FAULT CODE | POSSIBLE CAUSE | SOLUTION |
|---|---|---|
| 10-64 | Gas valve circuit error | Perform reset – if problem repeats, contact a heating engineer |
| 10-65 | Gas valve circuit fault | Perform reset – if problem repeats, contact a heating engineer |
| 11-64 | Ignition does not take place | Make sure valve on gas line is opened – perform reset after third unsuccessful ignition trial |
| 11-65 | Flame stabilisation fault | Wait for boiler’s ignition trial |
| 11-66 | Flame signal loss in safety time | Perform reset after third unsuccessful ignition trial – if problem repeats, contact a heating engineer |
| 11-67 | Flame loss during operation | Temporary error – wait for the boiler to re-ignite |
| 12-64 | Ion control deviation is too big | Perform reset if needed – if problem repeats, contact a heating engineer |
| 12-65 | Ignition SCOT actuators fault does not take place | Perform reset if needed – if problem repeats, contact a heating engineer |
| 12-66 | Ion base valve exceeds lower factory limit | Perform reset if needed – if problem repeats, contact a heating engineer |
| 12-67 | Ion base valve exceeds the upper factory limit | Perform reset if needed – if problem repeats, contact a heating engineer |
| 12-68 | Ion base valve differs excessively from previous value | Perform reset if needed – if problem repeats, contact a heating engineer |
| 12-69 | Offset adaptation at limit | Boiler continues operation but contact a heating engineer |
| 12-70 | Offset adaption not executable | Boiler continues operation but contact a heating engineer |
| 13-64 | Fan speed error | Perform reset if needed – if problem repeats, contact a heating engineer |
| 13-65 | Fan speed error | Perform reset if needed – if problem repeats, contact a heating engineer |
| 16-64 | Flue temperature signalise overheating | Check flue gas discharge path – Perform reset if needed – if problem repeats, contact a heating engineer |
| 1J-64 | High limit thermostat signalise overheating | Check the valve of the radiators in the heating circuit – check the combi boiler water pressure – if water pressure is low, fill the heating circuit with water |
| 80-01 | Return temperature sensor fault | Perform reset – if problem repeats, contact a heating engineer |
| 81-01 | Flow temperature sensor fault | Perform reset – if problem repeats, contact a heating engineer |
| 81-65 | Domestic hot water solar temperature sensor fault | Boiler continues operation but solar sensor is defective – contact a heating engineer |
| 8A-46 | Freeze protection | Boiler does not operate if flow temperature sensor reads value less than 1°C – wait until the error code is removed from the screen |
| 8H-64 | Flow temperature steep rise | Make sure radiator valves are open enough to circulate water – your boiler will continue to operate again after a while – if problem repeats, contact a heating engineer |
| 8H-65 | Flow return temperature difference too much | Make sure radiator valves are open enough to circulate water – if problem repeats, contact a heating engineer |
| E1-64 | Flame detection before burner operation | Perform reset – if problem repeats, contact a heating engineer |
| E1-65 | Internal SCOT system error | Perform reset – if problem repeats, contact a heating engineer |
| E1-66 | Calibration condition error fault | No reset needed – wait for burner to restart – if problem repeats, contact a heating engineer |
| E1-67 | Missing calibration | Perform reset – if problem repeats, contact a heating engineer |
| E1-68 | Ion base value is outside the factory limits or saved incorrectly | Perform reset – if problem repeats, contact a heating engineer |
| E1-69 | Parameter CRC error | Perform reset – if problem repeats, contact a heating engineer |
| E1-70 | Parameter CRC error | Perform reset – if problem repeats, contact a heating engineer |
| E1-71 | EK lockout failure | Permanent error – contact a heating engineer |
| E1-72 | SCOT flame amplifier | Perform reset if needed – if problem repeats, contact a heating engineer |
| E1-73 | Internal PCB error | Perform reset if needed – if problem repeats, contact a heating engineer |
| H9-01 | Outside sensor fault | Boiler continues operation but outside sensor is defective – contact a heating engineer |
| HC-01 | Domestic hot water temperature sensor fault | Boiler continues operation but you must contact a heating engineer |
| HJ-08 | High system pressure | Discharge water down to 0.8 bar – you can bleed the radiators |
| HJ-09 | Low system pressure | Increase the system pressure to 0.8 bar |
| HJ-10 | Water pressure sensor fault | Contact a heating engineer |
| J6-01 | Flow temperature sensor overheating – can be a blocking error or a lockout error | Check the valves of the radiators in the heating circuit – check the combi boiler water pressure – if water pressure is low, fill the heating circuit with water |
| J6-20 | Return temperature sensor overheating – can be a blocking error or a lockout error | Perform reset if needed – if problem repeats, contact a heating engineer |
| J6-21 | Return temperature is higher than flow temperature | No reset needed – burner operates itself after a small amount of time – if problem repeats, contact a heating engineer |
| JJ-64 | Flue temperature sensor fault | Perform reset – if problem repeats, contact a heating engineer |
| U2-01 | Supply voltage is below low limit | Your boiler will continue operation but you must contact a heating engineer |
| U2-01 | Supply voltage is above high limit | Your boiler will continue operation but you must contact a heating engineer |
| U4-65 | OpenTherm room thermostat connection is defective | Your boiler will continue operation but OpenTherm room thermostat is out of operation – contact a heating engineer |
| U4-66 | CAN-bus timeout | If problem repeats, contact a heating engineer |
| U4-67 | Remote reset supervision | Switch off – switch on power mains – if problem repeats, contact a heating engineer |
| UA-64 | Blocking during BCC update process | Contact a heating engineer |
| UA-65 | PCB requires a BCC update | Contact a heating engineer |
| UA-66 | BCC-ID of internal EEPROM is inconsistent | Contact a heating engineer |
| UA-67 | BCC is missing | Contact a heating engineer |
Get FREE Compare Boiler Quotes
- Get FREE Quotes today
- Compare Best Prices
- You will be contacted by 3 Local Boiler Engineers