MDC XT 14E 2021 - Water Heater Trouble Shooting

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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