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13 Troubleshooting
Possible causes
Large domestic hot water tapping
happened recently before the
programmed start-up of the
disinfection function
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.
13.3.10 Symptom: Boiler abnormality detection
(HJ-11 error)
Possible causes
Communication cable problem
Boiler error
13.3.11 Symptom: Boiler/hydrobox combination
abnormality (UA52 error)
Possible causes
Boiler/hydrobox mismatch
Incompatibility of software
13.3.12 Symptom: The burner does NOT ignite
Possible causes
Gas tap is closed.
Air in the gas tap.
Gas supply pressure too low.
No ignition.
No spark. Ignition unit on gas
valve faulty.
Gas/air adjustment NOT correctly
set.
Fan faulty.
Fan dirty.
Installer reference guide
80
Corrective action
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.
Do NOT press the
button
while the disinfection function is
active.
Corrective action
Mount the communication cable
between the gas boiler and the
indoor unit properly.
Check the boiler display for error
information.
Corrective action
Make sure that the . setting is
set to 0.
Update the boiler and hydrobox
software to the latest version.
Corrective action
Open the gas tap.
Remove air from the gas pipe.
Contact the gas supply company.
Replace the ignition electrode.
▪ Check the cabling.
▪ Check the spark plug cap.
▪ Replace the ignition unit.
Check the adjustment. See
"To
check the carbon dioxide
setting" on
page 66.
▪ Check the wiring.
▪ Check the fuse. If necessary,
replace the fan.
Clean the fan.
Possible causes
Gas valve faulty.
13.3.13 Symptom: The burner ignites noisily
Possible causes
Gas supply pressure too high.
Incorrect ignition gap.
Gas/air adjustment NOT correctly
set.
Weak spark.
a
Spark gap (±4.5 mm)
13.3.14 Symptom: The burner resonates
Possible causes
Gas supply pressure too low.
Recirculation of combustion
gasses.
Gas/air adjustment NOT correctly
set.
13.3.15 Symptom: No space heating by the gas
boiler
Possible causes
Heat pump error
Communication problem with the
heat pump.
Incorrect heat pump settings.
The service display displays " ",
the gas boiler is switched off.
No current (24 V)
The burner does NOT fire on
space heating: sensor S1 or S2
faulty.
Burner does NOT ignite.
Daikin hybrid for multi heat pump – heat pump module
Corrective action
▪ Replace the gas valve.
▪ Re-adjust the gas valve, see
"To check the carbon dioxide
setting" on
page 66.
Corrective action
The house pressure switch may
be faulty. Contact the gas
company.
▪ Replace the ignition pin.
▪ Check the ignition electrode
gap.
Check the setting. See
"To check
the carbon dioxide setting" on
page 66.
Check the ignition gap.
Replace the ignition electrode.
Replace the ignition unit on the
gas valve.
a
Corrective action
The house pressure switch may
be faulty. Contact the gas
company.
Check the flue gas and the air
supply.
Check the adjustment. See
"To
check the carbon dioxide
setting" on
page 66.
Corrective action
Check the user interface.
Make sure the communication
cable is properly installed.
Check the settings in the heat
pump manual.
Switch on the gas boiler with .
▪ Check the wiring.
▪ Check the connector X4.
Replace sensor S1 or S2. See
"Error codes of the gas boiler" on
page 83.
See
"13.3.12 Symptom: The
burner does NOT ignite" on
page 80.
CHYHBH05+08AA + EHYKOMB33A
4P471761-1A – 2017.10
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Table of Contents
Troubleshooting
