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Old 20-01-2021, 05:01   #1
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Webasto diesel heater weird issue

My webasto air top heater is doing something strange... Turn the dial all the way up, it starts up, revvs up, blasts heat for a minute, then the pump stops clicking and the fan speed falls to barely above idle. Never really gets going fast again, altho the clicking pump sometimes starts up slow again after a few/20 minutes. There is NO error message/blinking light. I changed the fuel filter but no improvement. I changed the burner screen earlier as a stray fender blocked the exhaust and coked it up, the error codes were working fine then. I pulled the fuse to reset it. No other significant buildup anywhere...

Any ideas? Thermostat telling it its too hot? Why no error code?

Hope everyone is well, it's been a minute since I've been on here...
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Old 20-01-2021, 06:20   #2
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Re: Webasto diesel heater weird issue

Webasto ‘Air Top’: 2000 ST, EVO 40, & EVO 55
Troubleshooting begins on page 55.
http://www.techwebasto.com/phocadown..._evo_40-55.pdf

Webasto Air Heater Service Manual & PDF Guides ➥ https://www.butlertechnik.com/techni...air-heaters-d6

Webasto Controller Service Manual & PDF Guides ➥ https://www.butlertechnik.com/techni...ontrollers-d43

Webasto Useful Information & Guides ➥ https://www.butlertechnik.com/techni...formation-d112
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