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Failure Cause Measure
3.4 Fault finding
Blocked pilot burner
Blocked chimney
Safety thermostat
Thermocouple defective
Thermocouple makes no contact
Gas supply closed
Temperature is set too low
Control knob in position ( ✸ ) (pilot
burns )
Control knob in position ( l)
Flue safety device closed the gas
supply
Gas supply closed
Safety thermostat has closed the gas
supply because the water
temperature was too high
Hot water storage empty
Cause cannot be determined
Condensation of (flue) gasses
Insufficient sealing of the water
connections (thread)
Leakage from other water- appliances
or pipes near by
Gas smell
Pilot extinguishes
Insufficient or no
hot water
Water leakage
If you smell gas you should immediately close the main gas
tap you should not light any fire or switch on light, electrical
switches or bells. Open windows and immediately contact
your installer or the local gas company.
Clean the pilot burner
Find the cause and remove it.
Set the temperature regulator at a lower temperature.
Replace the thermocouple
Restore the connection
Open the gas tap
Set the temperature regulator at a higher temperature
Turn the temperature regulator completely clockwise; turn
control button to “on” ( ); turn the temperature regulator to
the desired position, preferably position 4. The appliance
now operates fully automatically.
Put the appliance into operation.
Press the reset button - if present - on the safety thermostat
and put the appliance into operation. If this occurs more
often then you should inform your installer.
Open the gas tap and put the appliance into operation.
Set the temperature regulator at a lower temperature and
reignite the pilot burner.
Reduce the consumption of hot water. Allow the appliance
time to heat the water.
Turn the control button to the ( l) position. Close the gas tap
and inform your installer.
See “Condensation”.
Tighten the threaded connections.
Trace the cause.