MDC FORBES 12+ - Circuit Breaker; Water Heater Trouble Shooting; Gas Operation; Water Supply

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Circuit Breaker
There is a circuit breaker allocated to the water heater circuit switch on the main electrical panel. To reset this
breaker, push in.
Water Heater Trouble Shooting
Gas Operation
Symptom
Cause
Remedy
When switching on, the heater does not
operate.
No 12 V DC supply
voltage.
Check the power supply (operation
voltage min. 10.5 V). Check the
Truma UltraRapid fuse (refer to
maintenance “Fuses”).
When switching on, the heater does not
operate, and the red lamp lights up after
approx. 30 secs.
– Cowl cover fitted.
– Air in the gas supply.
– No gas supply.
– Incorrect gas pressure.
Remove cowl cover and / or clear
any obstruction.
Check gas valves and gas cylinder.
To unlock (and purge air), switch
off the appliance, wait 5 minutes,
and switch on again.
Heater operates for a prolonged
time and then the red lamp lights up.
Excess temperature
thermostat has responded.
Check water level, refill if required
(close drain valve).
To unlock, switch off the appliance,
wait 5 minutes, and switch on
again.
Water Supply
Symptom
Cause
Remedy
Water drips from the P&T safety
valve.
– Water pressure to high.
– Lime or dirt under the P&T safety
valve seat.
Check water pressure (max. 400
kPa), use a pressure reducer
when connected to central water
supply.
Allow the appliance to cool and
then slowly raise the test lever (Fig.
2a – 4a) to flush the water system
and attempt to force dirt or
foreign matter out of the P&T
safety valve seat.
Replace P&T safety valve. This
must be performed only by a
certified service technician.
When opening the cold water tap,
hot water comes out.
– Hot water flows back through the
cold water supply.
-Fit a non-return valve in the cold
water supply (refer to installation
instructions “Water connection”).
-Non return valve faulty