HELP!!!! Aquahot again.

[Vfaozzy]

I was able to capture this on video...please watch what it is doing and help me if understand...thermostat problem?

https://www.youtube.com/watch?v=E7-YXmF9xf0

[fairway2002]

With not knowing whats is wrong. I see a zone running on burner. With temp hitting the bubble. temp on and off.

[loranimal]

What am I watching for? I saw the "Heating status" flicker a couple times, was that it?


4.6 Heating Status Indicator Light
This indicator light will illuminate GREEN whenever the Aqua-Hot’s VDC/VAC Control
Thermostat is calling for heat, allowing the water and antifreeze solution in the
Aqua-Hot’s Boiler Tank to be heated by either the Diesel-Burner and/or the 120 VAC
Electric Heating Element; reference Figure 5. When this indicator light is off, no heat is
being supplied to the Aqua-Hot’s Boiler Tank. Please note that this light will only be
active if either the “Diesel” and/or the “Electric” switch are turned ON; reference Figure 4.
NOTE: The Aqua-Hot’s VDC/VAC Control Thermostat will automatically activate the
Diesel-Burner and/or the 120 VAC Electric Heating Element only if the “Diesel” and/or
the “Electric” switch is in the ON position. In order to heat the motorhome/domestic hot
water, simply choose the desired heat source(s) and leave the switch(s) (i.e., “Diesel”
and/or “Electric”) ON.


Maybe you have a thermostat going bad or the wiring going to it.


Carl

[Vfaozzy]

The burner is on and heating then the heating status light flickers when the fluid is up to temperature which shuts the burner down and starts the cooling (purging) sequence. The problem seems to be that the heating status lght then comes back on and continues heating. You can see boiling bubbles start rising in the overflow tube. I am with you thinking it’s the control thermostat...I will have one in hand tomorrow and replace. Thank you for helping

[Dennis4809]

What model AquaHot and what happens if you select Electric vs Diesel? Number of thermostats varies with the model.

[Vfaozzy]

2016 : 450D -DE4, with electric and Burner selected at same time the burner will still default and the burner switch light will go out.

[Vfaozzy]

It looks like the Control Thermostat was the issue! I replaced it this morning and the system has been running normally every since. I really appreciate your time and effort helping me with this, THANK YOU!!!!