20
Fault
Possible cause
Measure
Smelt of gas
Gas leak.
If you smell gas, close the main gas tap immediately,
do not light any flames, switch on any lights or operate any
other electrical switches or bells. Open windows. Contact
your installer or local gas company immediately.
Pilot light will
Dirty pilot burner.
Clean pilot burner.
not light or
goes out
Blocked chimney.
(Get someone to) Investigate the cause and rectify it.
Overheat thermostat is engaged.
Allow the water in the heater to cool off and set a lower
water temperature
Faulty thermocouple.
Replace thermocouple.
Thermocouple does not make contact.
Repair connection.
Gas supple shut off.
Open gas tap.
Faulty piezo ignition.
Replace electrode.
Insufficient hot
Temperature setting too low.
Set a higher temperature.
water, or none
at all.
Pilot light extinguished.
Start heater.
Therminal Reflux Safeguard (TRS) has
After resetting the TRS, restart the heater. If this happens
shut down heater.
more often, call your installer.
Gas supply shut off.
Open gas tap.
Overheat thermostat is/has been
If necessary, allow the water in the heater time to cool
engaged.
down and then set a lower temperature.
Supply of hot water exhausted.
Reduce hoy water use. Give the heater time to heat up
the water.
Unidentifiable cause.
Press red button all the way in. Close gas tap and call
your installer.
Water leakage
Flue-gas condensation.
See 'Condensation'
Water connections inadequately
Tighten the screw thread connections.
sealed (screw thread)
Leakage from other water heaters or
Track down the cause.
pipes in the vicinity
Explosive
Wrong inlet gas pressure and/or burner
Set correct inlet pressure and/or burner pressure.
ignition
pressure.
Dirty injectors
Clean injectors.
Poor flame
Wrong inlet pressure and/or burner
Set correct inlet pressure and/or burner pressure.
image
pressure.
Inadequate air supply
Improve air supply (ventilation).
4.2
FAULT OVERVIEW