MDC XT16HR Series, Owner'S Manual

Page: 54 / 107

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Water Heater Trouble Shooting
Gas Operation
Water Supply
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.
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