Rheem
26
LockoutReversed polarity
L1/N or ground.
Walk 26 in Diagnose
8 plates — walk the one on the cabinet
First check
1 Hot and neutral at the IFC, not the disconnect
On Rheem R801S polarity/ground is measured at the board. A correctly landed disconnect with a swapped whip at the IFC still throws this. Hot/neutral at the IFC.
Expect: L1 hot, N neutral, ~120 VAC L1 to N, ~0 VAC N to ground.
The rest of the walkthrough is Diagnose.
On the plates
- Hot and neutral at the IFC, not just the disconnect.
- Burner-box ground screw. Painted screw, missing star washer.
- Hot/neutral at the IFC. Chassis ground.
- Hot/neutral at the IFC.