Diesel heaters

what brand is it
mechpete

all the MBenz ambulances in Victoria that had Wabasko heaters fitted had no trouble,
then they tried to save money by fitting cheap copies , every one of them had to go back an be replaced or repaired .
false economy
mechpete

If it has the standard Webasto etc interface you can get a computer interface to read the fault codes.

If it goes through the usual start up proceed and you have a unit where you can hear the fuel pump do you smell diesel at the exhaust pipe? if not then look for a damage fuel line, pickup or blocked filter.

Is the fuel gelled?

If you can smell fuel then check the glow plug/igniter.

A common reported problem with them is the glow plug failing.

If your fuel pump/deliverly is ok I'd be looking at replacing the glow plug.

Rickcheck your air intake inside the caravan the air that is sucked via your vent back into the heater ,if this vent gets restricted it will only allow the heater to run till unit gets to hot then shuts down .Could have sucked some thing up from inside van or dust is restricting air flow .This is the intake vent inside the unit not the intake from outside
Terry

Rickcheck your air intake inside the caravan the air that is sucked via your vent back into the heater ,if this vent gets restricted it will only allow the heater to run till unit gets to hot then shuts down .Could have sucked some thing up from inside van or dust is restricting air flow .This is the intake vent inside the unit not the intake from outside
Terry

Another thing to prevent start-up is low voltage.

Paul

Check that the combustion air inlet or exhaust isn't blocked by mud wasp or spiders nests.