Rheem Furnace: Burners go out before the heat call ends / short cycling
Burners go out before the heat call ends / short cycling on a Rheem furnace: Main burners do not stay lit until the thermostat is satisfied, or the room temperature is not held near setpoint.
Applies to: Rheem (-)GRC/(-)GTC and 90RJ/90TJ 90 Plus condensing gas furnaces
Common causes of burners go out before the heat call ends / short cycling
- Pressure switch dropping out
- Limit opening (airflow, over-firing, rollout)
- Weak flame sense
- Thermostat location, anticipator setting, compatibility
- Oversized furnace
How to fix burners go out before the heat call ends / short cycling: step by step
- Check whether the pressure switch drops out during the run (see 2 blinks).
- Check whether the limit circuit or the IDM wire through the aux. limit opens and closes - STATUS should show 3 blinks; check airflow, limits, rollouts and over-firing.
- Confirm the FLAME LED is steady on with burners lit; if blinking or off, clean the flame sensor and check ground/polarity.
- Make sure the thermostat is not affected by registers, fans, sunlight, heat through walls, pipes or wires in walls.
- Check the heat anticipator setting; the furnace may need an isolation relay (SPST, 24 VAC coil, contacts rated 0.5 A min at 24 V).
- Verify the furnace is correctly sized.
If the unit shows an error code, look it up: Rheem Furnace codes
Models
Rheem 90RJ/90TJ 90 Plus
90RJ0490RJ0690RJ0790RJ0990RJ1090RJ1290TJ0490TJ0690TJ0790TJ0990TJ1090TJ12
R95P
R95PA0401317MSAR95PA0601317MSAR95PA0701317MSAR95PA0851521MSAR95PA1001521MSAR95PA1151524MSA
Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC)
R802PA050314MSAR802PA075417MSAR802PA100521MSAR802PA125524MSAR802PA150524MSA
RGPE/RGLE
RGLE-05(-)BMKRRGLE-07(-)AMKRRGLE-07(-)BRQRRGLE-10(-)BRMRRGLE-12(-)ARMRRGPE-05(-)BMKRRGPE-07(-)AMKRRGPE-07(-)BRQRRGPE-10(-)BRMRRGPE-12(-)ARMR
Rheem (-)GRC/(-)GTC 90 Plus
RGRC-04EMAESRGRC-06EMAESRGRC-07EMAESRGRC-07ERBGSRGRC-09EZAJSRGRC-10EZAJSRGTC-04EMAESRGTC-06EMAESRGTC-07ERBGSRGTC-09EZAJSRGTC-10ERBJS
Rheem RGRM/RGTM 90 Plus
RGRM-04RGRM-06RGRM-07RGRM-09RGRM-10RGRM-12RGTM-06RGTM-07RGTM-09RGTM-10
Source: Rheem (-)GRC/(-)GTC Installation Instructions 92-24161-88-00, Figure 56 IFC Troubleshooting Guide, p.54 (printed); Rheem 90RJ/90TJ Installation Instructions 92-24161-32-08, Figure 53, p.54. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.