Examine plug and socket contacts and insert plug firmly into socket
b) fuse blown
Test for earth fault and replace fuse
c) saloon thermostat operated (auto types only)
Check saloon temperature and test by shorting out saloon thermostat
d) control panel or wiring
Change panel and test on test rig
e) motor o/ circuit
Change heater. If within 4 months of installation test on rig wires 8/9
f) excess heat thermostat or micro switch on electronic type o/ circuit
Ensure battery voltage at 20v minimum. Replace heater and test on rig
Stops at end of cycle
a) fuel fault
Ensure fuel supply to heater - fuel valve unrestricted. Check battery voltage
at 20v minimum (with lights off). Lightly tap solenoid to assist if voltage is low
b) flame detection thermo or thermistor on electronic type o/ circuit
Replace thermostat, remove heater if fitted with electronic type and test on rig
c) glow plug carbonised or o/ circuit
Check battery voltage with lights off. Replace glow plug, check resistance box
for heat indicating circuit complete
Stops after a few minutes
a) poor combustion
Check battery voltage with lights off. Ensure motor speed correct and not fouled mechanically
b) fuel restriction
Ensure fuel lines clear and filter satisfactory. Check for water content or dirt
c) excess heat thermostat or thermistor on electronic type operating
Check saloon air intake filter for restricted air flow, noted by overheat
indication on outer case around output end of heater
Will not stop (cold air)
a) flame detaction thermostat or thermistor (electronic type) sticking or o/ circuit
Change thermostat - change heater and test on rig
b) relay contacts shorted on auto type
Replace auto panel
Running slow
a) battery voltage low
Switch lights off and check battery charge
b) motor commutator or brushes faulty
Tap heater lightly at fan end to check - renew heater
