9.10
Fault Tracing Guide
9.10.1 Gas Operation
Primary Symptom
Cause
Cure
When switching on from
cold, no indicator lights
come on
No power at wallswitch.
Reversed power supply
Check wire connections.
Check polarity of connection from
motorhome wiring to wallswitch.
Correct polarity and replace fuse
When switching on from
cold, green light comes
on, burner fails to light
Power not reaching heater
Check wiring from wallswitch to
heater for disconnection
When switching on from
cold, green and yellow
lights come on
Voltage below 10.5v
Charge battery
When switching on, green
and red lights come on
No gas or air in supply line
Purge by switching on several times
or change gas bottle
Yellow light comes on
when pump is operated
Voltage near 10.5v
Charge battery
Red light comes on and
after 30-40 mins, water
and steam.
Fusible plug blown
Replace module and fusible plug
Occasional operation of
red light (lock-out)
Incorrect gas pressure
Check regulator or change gas bottle
Water coming from cowl
Pressure relief valve operating
on temperature rise
Check pump pressure for high value
Isolating switch indicator
light not alight
No power
Check fuse or RCD for open circuit
9.10.2 Mains Electrical Operation
Symptom
Cause
Cure
Mains immersion heater
does not operate
No power
Re-set trip operated
Check supply fuse or RCD
No water, fill and re-set (if operates
again seek service attention)
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