11 Failed ignition

What the control is telling you

No flame proven during the ignition trial. The system tries 4 times, then goes into a 1-hour lockout (10 and 11 alternate on 802P/R95P). 802P: valve opens on low fire for 8 seconds, spark up to 7 seconds, flame must prove for 1 second. R95P/RGPE: valve powered about 7 seconds per trial. RGPE/RGLE: not stored back-to-back in the fault buffer.

Applies to: 802P/80MDP (802PA050-150); R95P (R95PA040-115); RGPE/RGLE 2-stage 80+

Likely causes

• No gas, manual valve switch off, or low gas pressure
• Spark igniter not sparking, cracked, disconnected or misplaced
• Dirty flame sensor or poor sensor wiring
• L1 and neutral reversed
• Poor ground
• Blocked orifice / gas restriction
• R95P: pressure switch or limit opening during the trial

Test and repair steps

1. Warning: Verify gas valve inlet and outlet (manifold) pressure with a manometer.
2. Confirm the gas valve switch is ON and gas is supplied.
3. Watch for spark check igniter wires, connection, cracks and placement/alignment.
4. Clean the flame sensor rod (fine steel wool, Scotch-Brite or sandpaper) and check its wire to the IFC (RGPE/RGLE: J1 pin 1).
5. Verify L1/neutral polarity at the IFC and junction box and check ground.
6. Check orifices and burner alignment; confirm flame carries across all burners.
7. R95P check 24 V at the gas valve during the trial and wiring IFC to valve; on 90+ check the aux limit and (upflow) drain pressure switch are closed.
8. R95P if a pressure switch or limit opened during the trial, troubleshoot that circuit (57 / 22).

Settings for these units

• Clearance to combustibles (all models) · R95P
• Filter sizes as shipped, upflow (Table 19) · RGPE/RGLE
• Reduced clearance to combustibles, upflow/horizontal (Fig. 4) · Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC)
• Reduced clearance to combustibles (Fig. 3 and 4) · RGPE/RGLE