Daikin Boiler Fault Codes

41 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.

41 fault codes
5 models documented
5 currently sold
0 legacy models

Daikin fault codes on this site

We document 41 fault codes across 5 Daikin models, covering 28 distinct codes. Daikin boilers use plain numeric codes such as 0, 1, 2. Codes for 5 of these models are taken directly from the manufacturer's own service or installation manual. Daikin is a smaller name in the UK market, and if you own one this is likely one of the few places its fault codes are collected in one place.

Models covered: D2CND, D2TND024, Altherma Hybrid EHYKOMB33, EKOMBG 22, EKOMB 22 Combi.

Codes that appear on the most Daikin models:
2 4 5 6 8 0
Just want the most common Daikin problems?
The top 8 faults across the whole Daikin range — causes, DIY checks, repair costs.
Most serious

High-severity Daikin fault codes

HJ-09
Your boiler has detected that the water pressure is too low to operate safely, causing it to shut down temporarily.
D2CND
 Err HJ-09
Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low.
D2TND024
 0
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
 1
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
 2
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

D2CND
Combi
2 fault codes · 2017-present
D2TND024
System
1 fault codes · 2017 onwards
Altherma Hybrid EHYKOMB33
Combi
24 fault codes · 2013 onwards
EKOMBG 22
Combi
8 fault codes · 2014 onwards
EKOMB 22 Combi
Combi
6 fault codes · 2014 onwards
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