[wthardman]

Having all the same issues with an Aqua Hot heater. Cannot keep it running. Used the factory pick up tube and kept getting an E032 combustion failure. Ended up cutting in the recommended Aqua Hot pickup tube. Same problem. Guess I have cavitation??? If I run the heater into a gas can, it runs without issue. The minute I reconnect to the pickup tube it runs for 20-38 minute before E032 again. Eliminated the filter rerouted the lines to ensure no place for air bubbles and same problem. New fuel pump...same problem. Double checking fittings for venturi effect. Any ideas? Any chance of vacuum on the tank?

Thanks,

Troy

 

[wthardman]

Have any pictures of the tank and gas can setups? My first guess was going to be the run of the fuel line has a high point where bubbles are collecting when you're connected to the tank that gets corrected when reconfiguring for the gas can, but sounds like you already checked for that. Is the total fuel line length the same when testing with the gas can? If the fuel line gets nudged closer to a source of heat when in the tank setup vs gas can, that could also potentially cause issues.

If you're able to get underneath while it's running and temporarily remove whatever protection you have over the fuel line (and assuming the fuel line's at least opaque), watching the flow/bubbles may provide some insights. 🤷‍♂️ Disclaimer I don't have an Aqua Hot system, this is pulling from my research for our Espar Airtronic.

Thanks for the insight. What we have found is the dealer did not hook up the intake air tube. We were cycling flue gas back through the heater. With that being said, we still have some air bubbles in the fuel line. We have had the heater running for four hours before E032 again. Still working to isolate the source of the air bubbles.