Aquahot AHE100 Webasto Diesel Faults
Our Aquahot runs just fine on diesel, most of the time. However, it will Fault (light in switch goes out) occasionally. This happens about once every two days on average. With the electric element Off, it has faulted 3 times in 4 days, which is about typical. Each of these three times, turn off the switch for 15 to 30 seconds, back On and the burner has ignited immediately and normally after the short prime cycle.
The unit was recently serviced; new nozzle, filter, and clean combustion chamber. After that, to correct a fuel leak, installed bearing kit, new fuel pump, and solenoid kit. Also, ohm'ed the the flame sensor/detector and it was within spec. Of course, since I did this work, anything is possible.
There is no pattern to the Fault occurrences. It will work fine for four days, two days, 1 day, or 4 hours!
I am suspicious of the coil, which reportedly can be intermittent and thus hard to test.
I believe the Fault occurs when the burner tries to ignite and fails. Fuel supply, incorrect spark gap, coil, or 
?
Ideas???
Thanks, Dick
Topic: Aquahot AHE100 Webasto Diesel Faults