Rheem Furnace: Furnace short cycles or does not hold setpoint

Furnace short cycles or does not hold setpoint on a Rheem furnace: Heat cycles end early or room temperature drifts.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: (-)802PA050314MSA, (-)802PA075417MSA, (-)802PA100521MSA, (-)802PA125524MSA, (-)802PA150524MSA and matching (-)(-)80MDP models

Common causes of furnace short cycles or does not hold setpoint

• Thermostat badly located
• Heat anticipator setting
• Limit opening and closing on low airflow
• Furnace oversized

How to fix furnace short cycles or does not hold setpoint: step by step

1. Check thermostat location: away from registers, sunlight, pipes/wires in walls.
2. Check heat anticipator setting; an isolation relay may be needed.
3. Check if a limit is cycling (code 22): filter, ducts, blower speed, temperature rise.
4. Verify furnace size against load.

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