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9.2.4 No domestic hot water (DHW)
9.2.5 Domestic hot tap water does not reach the correct temperature
Possible causes Analysis Solution
The power LED is not shown. Yes
↓ No
Check the power supply.
Check the fuse; see Electrical schematic § 11.1.
Flow sensor does not work.
Yes
↓ No
Replace the flow sensor.
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 sensor (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 §8.1.2.
Insuicient heat transfer due to
calcium or contamination in the
domestic hot water-sided central
heating boiler.
Yes
↓ No
De-calcify or flush the domestic hot water-sided central heating
boiler.
The central heating system becomes
warm while tapping water.
Yes
↓ No
Undesirable circulation during domestic hot water demand in
the central heating circuit due to thermo-siphon of the second
pump in the central heating circuit. Place a check valve (in the
case of thermo-siphon) or a two-way valve (if there is a second
pump).
Central heating pressure is too low. Yes
↓ No
Top o the central heating system until the central heating
pressure is between 1 and 2bar.
The flue is blocked. Yes Check the flue.
Possible causes Analysis Solution
Inlet pressure is too high. Yes
↓ No
The home pressure regulator may be defective. In that case,
contact the energy company.
Ignition distance is incorrect.
Yes
↓ No
Replace the ignition pin including the ignition cable.
Gas-air control is not correctly
adjusted.
Yes
↓ No
Check the adjustment; see §8.9 and §8.10.
The spark is weak. Yes Check and/or replace the ignition cable.
Replace the ignition unit in the top cover.
Replace the ignition pin.
9.2.6 Burner ignites loudly
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