15 Troubleshooting
Installer reference guide
88
EJHA EHY32AA
Daikin Altherma Hybrid hydrosplit heat pump
4P531180-1 – 2018.06
15.4.6
Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
Corrective action
Gas boiler operation is not
activated
Check and make sure that:
▪ The gas boiler is switched On
and is NOT in standby mode.
▪ The
communication
cable
between the gas boiler and the
outdoor
unit
is
properly
mounted.
▪ There is no error code on the
gas boiler display.
The gas boiler equilibrium
temperature has not been
configured correctly
Increase the "equilibrium
temperature" to activate gas
boiler operation at a higher
outdoor temperature. Go to:
▪ [A.5.2.2] > Installer settings >
Heat sources > Boiler >
Equilibrium temp. OR
▪ [A.8] > Installer settings >
Overview settings [5‑01]
There is air in the system.
Purge air manually or
automatically. See the air purge
function in the "Commissioning"
chapter.
15.4.7
Symptom: The pressure at the tapping
point is temporarily unusually 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.
15.4.8
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
sched. is selected, it is
recommended to program the
start-up of the disinfection
function at least 4 hours later
than the last expected large hot
water tapping. This start-up can
be set via the 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.
Possible causes
Corrective action
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.
15.4.9
Symptom: Boiler abnormality detection
(HJ-11 error)
Possible causes
Corrective action
Communication cable problem
Mount the communication cable
between the gas boiler and the
outdoor unit properly.
Boiler error
Check the boiler display for error
information.
15.4.10 Symptom: Boiler/hydrobox combination
abnormality (UA52 error)
Possible causes
Corrective action
Boiler/hydrobox mismatch
Make sure that the . setting is
set to 0.
Incompatibility of software
Update the boiler and hydrobox
software to the latest version.
15.4.11 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 carbon dioxide
setting" on page 75
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 75
15.4.12 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.
the carbon dioxide setting" on
page 75
.
