13 Troubleshooting
Installer reference guide
84
RVLQ05+08CAV4 + RHYHBH05AA + RHYHBH/X08AA +
RHYKOMB33AA
ROTEX HPU hybrid
4P355635-1 – 2013.05
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 71.
Weak spark. Check the ignition gap.
Replace the ignition electrode.
Replace the ignition unit on the
gas valve.
28.3~30.2 mm
a
a
Spark gap (±4.5 mm)
13.3.13 Symptom: The burner resonates
Possible causes Corrective action
Gas supply pressure too low. The house pressure switch may
be faulty. Contact the gas
company.
Recirculation of combustion
gasses.
Check the flue gas and the air
supply.
Gas/air adjustment NOT correctly
set.
Check the adjustment. See "To
check the carbon dioxide
setting" on page 71.
13.3.14 Symptom: No space heating by the gas
boiler
Possible causes Corrective action
Heat pump error Check the user interface.
Communication problem with the
heat pump.
Make sure the communication
cable is properly installed.
Incorrect heat pump settings. Check the settings in the heat
pump manual.
The service display displays " ",
the gas boiler is switched off.
Switch on the gas boiler with .
No current (24 V) ▪ Check the wiring.
▪ Check the connector X4.
The burner does NOT fire on
space heating: sensor S1 or S2
faulty.
Replace sensor S1 or S2. See
"Error codes of the gas boiler" on
page 86.
Burner does NOT ignite. See "13.3.11 Symptom: The
burner does NOT ignite" on
page 83.
13.3.15 Symptom: The power is reduced
Possible causes Corrective action
At high rpm, the power has fallen
by more than 5%.
▪ Check the appliance and flue
system for fouling.
▪ Clean the appliance and flue
system.
13.3.16 Symptom: Space heating does NOT reach
the temperature
Possible causes Corrective action
Weather-dependent setpoint
setting is incorrect.
Check the setting on the user
interface and adjust if necessary.
Temperature is too low. Increase the space heating
temperature.
No circulation in the installation. Check whether there is
circulation. At least 2 or 3
radiators MUST be open.
The boiler power has NOT been
correctly set for the installation.
Adjust the power. See "Maximum
space heating power setting" on
page 70.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger.
Descale or flush the heat
exchanger on the space heating
side.
13.3.17 Symptom: Hot water does NOT reach the
temperature
Possible causes Corrective action
Domestic hot water flow is too
high.
Adjust the inlet assembly.
Temperature setting for water
circuit is too low.
Set the hot water circuit on the
heat pump user interface,
depending on the desired
temperature.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger domestic hot water
side.
Descale or flush the exchanger
domestic hot water side.
Cold water temperature <10°C. The water inlet temperature is
too low.
13.4 Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
countermeasure before resetting the error code. This should be
done by a licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
13.4.1 Error codes: Overview
Error codes of the indoor unit
Error code Detailed error
code
Description
A1 00 Zero cross detection problem.
Power reset required.
Please contact your dealer.
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