Rheem Furnace: No heat – inducer (IDM) does not start

No heat - inducer (IDM) does not start on a Rheem furnace: POWER LED on, thermostat calling, but the induced draft motor never starts.

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

Applies to: Rheem (-)GRC/(-)GTC and 90RJ/90TJ 90 Plus condensing gas furnaces

Common causes of no heat - inducer (idm) does not start

• No 24 V on W
• Thermostat not in heat / dead batteries / wiring
• Lockout or fault code present
• No line voltage to IDM, bad wiring, bad capacitor

How to fix no heat - inducer (idm) does not start: step by step

1. Set FAN to AUTO and call for heat with the setpoint more than 10°F above room temperature.
2. Check for 24 V from W to C at the IFC; if none, check thermostat mode, batteries, wires and connections.
3. Check the STATUS LED: if blinking, follow the blink code; if steady on, check the pressure switch is not stuck closed (contacts, short, water) then the IFC.
4. If W is present and no code: check line voltage at the IDM, the wiring between IDM and IFC, line voltage on the IDM pins of the IFC connector, and the IDM capacitor (90+ only).

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