My guess is you have the former Whoosh (Whoosh
). Have you contacted Jack about this problem?
A common source of overheating
when the raw water flow is good and the thermostat has been eliminated is the heat exchanger. I had that problem with the original W60 on my P424. It required a thorough cleaning
Another possibility is an air lock in the coolant
hoses going to the hot water tank. That will normally result in an over temp alarm
condition. Eliminating the thermostat might cover up the problem, but not fix anything.
My solution to the airlock problem was to disconnect the water heater hoses from the engine and pour coolant into one hose until it flowed out of the other end and then reconnect the hoses to the engine.