33 Rollout switch (MRLC) open

What the control is telling you

A manual-reset limit (flame roll-out switch) has opened - flame rolled out of the burner area. Must be reset by hand. RGPE/RGLE: can indicate a blocked exhaust flue; thermostat shows Call For Service.

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

Likely causes

• Blocked flue or vent
• Blocked or cracked heat exchanger
• Overfiring / wrong orifice or high gas pressure
• Combustion air problem / combustion restriction

Test and repair steps

1. Warning: Do not jumper the roll-out switch. Find and fix the cause before resetting - fire and CO risk.
2. Inspect vent/flue and heat exchanger for blockage.
3. Check gas pressure and orifice size.
4. Check combustion air supply; 802P: test with closet door closed if installed in a closet.
5. Check the burner compartment for signs of rollout and wiring between IFC and the switch.
6. Reset only after the cause is corrected, then watch a full heat cycle.

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