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Old 02-04-2023, 07:43 PM   #1
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Aqua Hot 450DM (Heater fan operation)

Checking to see if anyone has had this issue… when operating the heating system, with the diesel burner I have no fan operation at the bedroom radiator mounted in the cabinet. I have 130 degrees at the bedroom radiator pipes. I can manually operate the fan for the bedroom by supplying a ground at the aqua hot control panel (under the coach) for the bedroom fan in question but it will not operate automatically. Any Ideas? All other heater fan are working. Thx in advance
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Old 02-05-2023, 09:53 AM   #2
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What is the room thermostat set at? It could be the thermostat isn't turned on or it is set low. Or it could be bad. If it was on and set at a higher temp, then try switching it with another thermostat.
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Old 02-05-2023, 10:07 AM   #3
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The toilet room in mine has a manual switch in the sink counter. It normally doesn’t come on with the zone it’s on. How about putting your coach year and model in your sig line
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Old 02-05-2023, 03:13 PM   #4
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Do other rad fans switch on ground side a well. If grounded does operate from thermostat and turn off with the others on that zone if any.
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Old 02-05-2023, 03:55 PM   #5
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Shootist touched on what I was thinking. On my setup, I have two heaters on the rear pump loop. If you have boiler fluid going through heating the heater, then the thermostat is calling for heat. The bedroom fan always operates but the bathroom fan is on a separate switch and can be turned off if you don't want the bath overheated. You may have something like this in your unit.

Also, the type coach and the particular controller for the Aqua Hot may help. For instance, on my digital controller there are 5 inputs for thermostats and fans. Only 3 inputs are used, so if there is a defect on one input, you may be able to switch the wires to a different input and have all the same functions.
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aqua hot, fan, heat, heater

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