Daikin EHYKOMB33AA2 [91/136] Troubleshooting
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Daikin EHYKOMB33AA2 [91/136] Troubleshooting

Daikin EHYKOMB33AA2 [91/136] Troubleshooting
13 Troubleshooting
Installer reference guide
91
EVLQ05+08CAV3 + EHYHBH05AA + EHYHBH/X08AA +
EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1A – 2016.02
Possible causes Corrective action
Too much heat pump capacity is
used for heating domestic hot
water (applies only to
installations with a domestic hot
water tank)
Check and make sure that the
"space heating priority" settings
have been configured
appropriately:
▪ Make sure that the "space
heating priority status" has
been enabled. Go to [A.8] >
Installer settings > Overview
settings [5‑02]
▪ Increase the "space heating
priority temperature" to
activate backup heater
operation at a higher outdoor
temperature. Go to [A.8] >
Installer settings > Overview
settings [5‑03]
13.3.7 Symptom: The pressure at the tapping
point is temporarily unusual high
Possible causes Corrective action
Failing or blocked pressure relief
valve.
▪ Flush and clean the complete
tank including the piping
between pressure relief valve
and the cold water inlet.
▪ Replace the pressure relief
valve.
13.3.8 Symptom: Tank disinfection function is
NOT completed correctly (AH-error)
Possible causes Corrective action
The disinfection function was
interrupted by domestic hot water
tapping
Program the start-up of the
disinfection function when the
coming 4hours NO domestic hot
water tapping is expected.
Large domestic hot water tapping
happened recently before the
programmed start-up of the
disinfection function
When the Domestic hot water >
Type > Reheat or Reheat +
sched. is selected, it is
recommended to program the
start-up the disinfection function
at least 4hours later than the last
expected large hot water tapping.
This start-up can be set by
installer settings (disinfection
function).
When the Domestic hot water >
Type > Scheduled only is
selected, it is recommended to
program a Storage eco 3hours
before the scheduled start-up of
the disinfection function to
preheat the tank.
The disinfection operation was
stopped manually: with the user
interface displaying the DHW
home page and its user
permission level set to Installer,
the button was pressed
during disinfection operation.
Do NOT press the button
while the disinfection function is
active.
13.3.9 Symptom: Boiler abnormality detection
(HJ-11 error)
Possible causes Corrective action
Communication cable problem Mount the communication cable
between the gas boiler and the
indoor unit properly.
Boiler error Check the boiler display for error
information.
13.3.10 Symptom: Boiler/hydrobox combination
abnormality (UA52 error)
Possible causes Corrective action
Boiler/hydrobox mismatch Make sure that the . setting is
the following for:
▪ 0=for EHYHBH05 +
EHYHBH08
▪ 1=for EHYHBX08
Incompatibility of software Update the boiler and hydrobox
software to the latest version.
13.3.11 Symptom: The burner does NOT ignite
Possible causes Corrective action
Gas tap is closed. Open the gas tap.
Air in the gas tap. Remove air from the gas pipe.
Gas supply pressure too low. Contact the gas supply company.
No ignition. Replace the ignition electrode.
No spark. Ignition unit on gas
valve faulty.
▪ Check the cabling.
▪ Check the spark plug cap.
▪ Replace the ignition unit.
Gas/air adjustment NOT correctly
set.
Check the adjustment. See "To
check the carbon dioxide
setting"on page78.
Fan faulty. ▪ Check the wiring.
▪ Check the fuse. If necessary,
replace the fan.
Fan dirty. Clean the fan.
Gas valve faulty. ▪ Replace the gas valve.
▪ Re-adjust the gas valve, see
"To check the carbon dioxide
setting"on page78.
13.3.12 Symptom: The burner ignites noisily
Possible causes Corrective action
Gas supply pressure too high. The house pressure switch may
be faulty. Contact the gas
company.
Incorrect ignition gap. ▪ Replace the ignition pin.
▪ Check the ignition electrode
gap.
Gas/air adjustment NOT correctly
set.
Check the setting. See "To check
the carbon dioxide setting"on
page78.
Weak spark. Check the ignition gap.
Replace the ignition electrode.
Replace the ignition unit on the
gas valve.

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