Help my Jandy LX lownox heater fan wont turn off unless I disconnect power

[DANNYHERNA]

My heater fan remains on even when heater is off. The only way to shut it off is to turn all power off at the junction box or disconnect power to the GUI

 

[ajw22]

Welcome to TFP.

Sounds like it could be a stuck relay on the power board.

@ps0303 @Pool Clown @swamprat69 ideas?

 

[JamesW]

Are there any error codes?

 

[DANNYHERNA]

No error codes until I attempt ignition.at that point I get a high limit switch error. The relay is that on the power module or the power block?

 

[DANNYHERNA]

Thank you for the quick reply. My first time posting

 

[JamesW]

I would replace the high limit. I suspect that the blower is running because it thinks that the heater is still hot.

 

[DANNYHERNA]

I will try that first. Ordering the part. That’s the switch over by the fan vent connected by the white wires to the fusable link closer to the burners correct.

 

[JamesW]

There are two hi-limit switches. A 135 degree switch and a 150 degree switch.

Get both.

Set (135 and 150) R0023200
135 degree switch R0022700
150 degree switch R0023000

The part location is shown in the manual parts breakdown. Start at 5:00

 

[DANNYHERNA]

Perfect. Thank you. I will update this once installed.