Investigating further, I do not have
A Hurricane heater. I have a Whale F600
Water heater and an HL2-16 Eberspacher diesel heater.
The water lines are interconnected and also includes an external heat exchanger.
The Whale unit works fine, but the Eberspacher will not fire up. When turned on, I can hear a fan or motor running, but the burner will ot fire. After a short period of time, it will shut off the fan/pump.