Dealth with those damn things for years at work. Ran 2 sometimes 3 all day, every day. Constant struggles to get them lit and keep them lit once they were into a few years of service. Some basics:
Be sure diesel has winter conditioner additive.
Be sure electrical supply is adequate. Limit extension cord length and upgrade wire size.
Replace fuel filter regularly. It may say weekly on the machine but monthly should do if fuel is filtered at supply source.
Replace burner nozzle annually. Religiously.
Clean photocell. An([electric eye) monitors the flame and soot can interfere.
Replace or upgrade control module. A rental dealer can give advice on this.
The high limit sensor near the front may be adjustable for outside temp. Try playing with that.
Combustion air inlet: This is adjustable and can be crucial to proper performance.
Some models have a drain at the front to expel raw unburned fuel after lighting failure. Be sure front is lower so fuel can drain.
Be sure chimney cap is in place when machine is outside and not in use. Rain and snow call cause rust in burner chamber.
At end of season it would be prudent to replace as many components as you can and do a thorough internal clean. These things always break down when you need them most.
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