Rheem R802VA07542117MSA Error Code A115_F: One-hour Lockout: Gas Valve Stuck Closed
What Does Code A115_F Mean?
The gas valve circuit on the R802VA is switched by a relay on the IFC board, and voltage should only reach the valve during an active heating cycle, after all pre-ignition safety checks pass and the inducer is running. A115_F is declared when the board detects voltage present on the gas-valve terminals with the inducer stopped — a condition that should never happen in normal operation, so the control responds with a one-hour soft lockout rather than attempting to ignite.
This code doesn't commit to a single root cause the way some of the board's other gas-valve codes do. A defective gas valve generating back-voltage, a control-board relay that isn't fully releasing, or wiring that has been miswired or damaged so it carries voltage to the valve terminal at the wrong time can all produce the same reading. That's a meaningful difference from A225_F or A226_F elsewhere on this board, which are declared only when the IFC has already isolated the fault to a specific internal relay; A115_F simply flags an unexpected electrical condition and leaves the finer diagnosis — valve, wiring, or relay — to bench testing.
Because the fault is a soft (self-clearing) lockout, the furnace will attempt to restart automatically after an hour. But the underlying issue involves the gas valve circuit, and if the valve is intermittently receiving voltage when it shouldn't, there is a real risk of unintended gas flow, so the cause should be found before the furnace is relied on again.
What You'll Notice
- The furnace shuts down and won't attempt to heat for about an hour before automatically retrying
- No flame or gas odor is present during the lockout itself — this fault is about a voltage reading, not confirmed gas flow
- The alphanumeric LED blinks "A115_F" one digit at a time with a roughly three-second pause between digits
- The same one-hour lockout recurs on subsequent heat calls if the underlying condition hasn't cleared
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Defective gas valve not responding to electrical signal | Most common | ✗ Call a pro → |
| Wiring issue between control board and gas valve | Common | ✗ Call a pro → |
How This Is Diagnosed
A technician reproduces the fault by measuring voltage at the gas valve terminals with the inducer stopped, then tests the continuity and isolation of the gas-valve relay on the IFC board. They also inspect the valve wiring harness and low-voltage thermostat wiring for chafing, pinched insulation, or a short that could be back-feeding voltage. If voltage is confirmed with the valve and wiring both testing healthy, the board relay itself is the likely cause.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The one-hour lockout recurs repeatedly instead of clearing after a single occurrence
- You've confirmed the thermostat wiring and transformer look undamaged but the fault keeps returning
- The furnace won't restart at all even after the lockout period should have ended
Frequently Asked Questions
Is this the same as a stuck gas valve?
Not necessarily — A115_F flags unexpected voltage on the circuit, which can come from the valve itself, a wiring fault, or a board relay problem, so a technician needs to isolate which one before any part is replaced.
Is it safe to keep resetting power to clear the lockout faster?
No — the one-hour timer is a safety feature, and repeatedly power-cycling the furnace doesn't address the underlying gas-valve circuit issue and can mask a developing problem.
What part usually needs to be replaced?
It varies by what the technician finds — a damaged wiring harness, a defective gas valve, or the control board are all possible outcomes, and cost depends on region and which part is at fault.
✓ Verified against manufacturer service manual — March 2026