BoilerFaultCodes
Daikin Boiler Fault Codes
76 fault codes across 5 Daikin boiler models — explained in plain English.
Japanese HVAC giant. Increasingly popular for heat pumps and hybrid systems in the UK.
Just want the most common Daikin problems?
The top 8 faults across the whole Daikin range — causes, DIY checks, repair costs.
High-severity Daikin fault codes
HJ-09 Err HJ-09 0 1 2
Your boiler has detected that the water pressure is too low to operate safely, causing it to shut down temporarily.
D2CND
Your boiler has detected that there is not enough water pressure in the system to operate safely, which has caused it to shut down.
D2TND024
Your system has detected a potential electronic reading error during its routine startup check and has stopped working to prevent further issues.
Altherma Hybrid EHYKOMB33
Your hybrid system has detected that the water temperature inside the unit is getting too hot, so it has temporarily shut down to prevent damage.
Altherma Hybrid EHYKOMB33
The system's control sensors have been incorrectly wired or swapped during installation or maintenance, preventing the boiler from correctly reading temperatures.
Altherma Hybrid EHYKOMB33
All models
5 Daikin boiler models
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