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10.2.4 No domestic hot water (DHW)
10.2.5 Domestic hot tap water does not reach the correct temperature
Possible causes Analysis Solution
The power LED is not illuminated. Yes
↓ No
Check the power supply.
Check the fuse; see Electrical schematic §12.1.
Flow turbine does not work.
Yes
↓ No
Replace the flow turbine.
Domestic hot water flow < 2l/min. Yes
↓ No
Increase the domestic hot water flow.
Domestic hot water sensor S3 is
defective.
Yes
↓ No
Replace domestic hot water sensor S3.
No electricity on the flow turbine (5V
DC).
Yes Check the wiring according to the schematic.
Possible causes Analysis Solution
Domestic hot water flow is too high. Yes
↓ No
Reduce the domestic hot water flow.
Setting for domestic hot water
temperature is too low.
Yes
↓ No
Increase the domestic hot water temperature; see §9.1.2.
Insuicient heat transfer due to
lime scale or contamination
within the DHW water circuit.
Yes
↓ No
De-scale or flush the domestic hot water circuit within the
boiler heat exchanger.
The central heating system becomes
warm while operating the domestic
hot water.
Yes
↓ No
For thermo-syphon Install a check valve in the CH return
pipework near the boiler. For under floor heating install a
"normally open" zone valve into the flow circuit. (see under
floor wiring diagram on our website).
Central heating pressure is too low. Yes
↓ No
Top up the central heating system via the boiler filling loop until
the pressure is between 1 to 1.5bar.
The flue is blocked. Yes Check the flue.
Possible causes Analysis Solution
Inlet Gas pressure is too high. Yes
↓ No
The Gas meter governor may be defective. In this case, contact
the energy company 0800 111999.
Ignition spark gap is incorrect.
Yes
↓ No
Replace the ignition pin complete with cable.
Gas-air control is not correctly
adjusted.
Yes
↓ No
Check the adjustment; see §9.9 and §9.10.
The spark is weak. Yes Check the ignition cable is connected to the ignition module
correctly.
Replace the ignition module mounted within the top cover.
Replace the ignition pin.
Burner is defective Yes Replace the burner.
10.2.6 Burner ignites loudly
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