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If flame light does not come on Most likely one of these things.
1.Wire to flame sensor shorted possibly touching metal
2.Ceramic on flame sensor cracked
4.Wrong flame sensor
5. Wires not seated good in the 12 pin molex connector so not making good contact at board.
6.Furnace does not have a goof ground.
Since you have replaced flame sensor and board, check for good ground, short or skinned place on the orange wire and push the wires into the 12 pin connectors good.
Let me know if that helps. If not let me know if you have a meter to check micro amps .
We will want to see if flame rod is sending enough micro amps to board.See video below.
Make sure these wires are seated good.
If you are only getting .09mA, that is not enough. Make sure sensor is in flame good. Also do you know for sure this is correct flame rod?
You should have the 62-23543-01
The 2mA should be sufficient. The ***** *****ght should at least flash when you hit the 2mA. If the ***** *****ght does not come on, you may have gotten a DOA board, not unusual as most of these are imported..Can you exchange board?
No that is all built into the board for safety purposes.
The items listed above are the only things I know of that will prevent the flame light from coming on. Is the furnace hard wired to a good ground or plugged into a receptacle? I have seen them work fine for years using a receptacle and for no obvious reason stop working unless we have a hard ground.
Visually inspect to make sure ground wire is secured from gas valve to cabinet and furnace ground in disconnect power supply.
Usually thee is a ground that goes from gas valve to cabinet screw.Ground from inducer usually connects to it
Let me know if that helps.These things listed are about all I can think of that would cause the issue.I have been a Rheem dealer since 1989.
Possibly gas pressure .Do you have a manometer of pressure gauge to check water column?