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Phil
Phil, Mechanical Engineer.
Category: Plumbing
Satisfied Customers: 8769
Experience:  Retired mech. contractor, shop owner, 51 yrs experience.
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I have a for spring hybrid water heater and keep getting a

Customer Question

I have a for spring hybrid water heater and keep getting a F20 code. I have checked the drain lines and the pan and they are all clear I even poured water into the pan and it flowed out fine
Submitted: 2 months ago.
Category: Plumbing
Expert:  Phil replied 2 months ago.

Greetings. the water sensor in the drain pan is defective and needs to be cleaned or replaced..

.if cleaning fails, then unplug the drain pan liquid sensor wires from the printed circuit board, if you still get an F20 failure code, jumper the two sensor wires together, if you sill get the F-20 code the printed circuit board is bad

If you do not get the F20 code when the wires are either connected or disconnected from the printed circuit board, then replace the sensor

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Attach a close up photo of the wiring diagram glued to the inside of the blower access door and I will mark it up with troubleshooting instructions then follow up with step by step training and coaching until you have a solution.

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