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Technical Support / Re: Aqua Hot suddenly not heating?
« Last post by Roger Milne on May 15, 2026, 02:57:08 AM »Roger
You stated that the aqua Hot burner comes on with the switch and that it runs for a little while and then and runs a purge cycle and shuts off followed by the light in the switch going out.
Are you sure that the burner actually ignites or are you just hearing the blower run while it runs through the purge cycle ,tries to ignite and run through another purge cycle and shuts down.
The little processor that runs the aqua Hot burner is set up to ignite using a small ignition coil and a pair of electrodes, the burner will run through a per cycle first to make sure there's nothing combustible in the combustion chamber and then it opens the fuel solenoid and runs the igniter ignition coil to ignite the burner. if the photo cell in the burner arrangement does not see a light ie a burning flame the controller then shuts down the fuel solenoid valve and runs a purge cycle after which it turn off the lamp in the switch notifying you that the burner has failed to ignite.
it will stay this way until the next time you turn the switch off and then back on.
The alcohol is a wonderful unit when it works but it does require regular maintenance to make sure that it works efficiently and well.
The first thing to do would be to do a full service on the burner this requires removing the burner head to access the combustion chamber and burner tube the burner tube can then be removed and cleaned along with the burner chamber itself it's common for these to get suited up which creates all sorts of problems with the burner. As part of the service it would be a good idea to replace the burner spray nozzle as these are aware item and should be done annually. Of course the new fuel filter should be installed and the ignition electrode alignment and GAP should be checked apart from that there isn't a lot to do on a servicing and like I said it should be an annual event once you become familiar with the system it isn't all that daunting the hardest part is getting the cover off to get to the burner.
There are several faults that can result in a non-ignition event or a flame out.
1) lack of spark or bad ignition coil dirty ignition electrodes or electrodes that are not gapped properly.
2) lack of fuel possibly a plugged fuel filter plugged nozzle or a bad nozzle spray pattern.
3) a photocell that is inoperative or just plain suited up so it can't see that the light of the flame.
You should be able to find the manual for your particular aqua hot model number in the coach assist library that manual will walk you through the complete service and repair of the unit.
Hope this helps
Eric
So this info defintely sounds more in line with my symptoms. I’ll do the maintenance you suggested. But kind of annoying if it is this as I just hadn’t professionally serviced ie new nozzle filter and cleaning etc done back in November. But I’ll go through it again just to remove the possibilities.