Rheem Error Code 93: Internal control fault (Furnace)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Rheem error code 93 on a furnace means: Internal control fault. It is also called Rheem diagnostic code 93.

Critical severityFurnaceRheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC) · R95P · RGPE/RGLE

Homeowner? What Rheem code 93 means for you

Stop and call Your furnace is reporting: Internal control fault. This code is a safety shutdown. Turn the furnace off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Rheem error code 93 mean?

Internal furnace control fault. 802P/R95P: hard lockout - internal fault, or voltage on the gas valve contacts (welded relay) that does not clear when the inducer cycles; cycling the heat call will not reset it. RGPE/RGLE: CONTROL FLT, Call For Service. 802P manual lists 93 in the flowchart but not the main fault table.

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

Common causes of Rheem code 93

IFC internal failure
Gas valve relay welded
Miswiring feeding voltage to the gas valve circuit

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Rheem models that use code 93

Show all 21 models

R95PA0401317MSA R95PA0601317MSA R95PA0701317MSA R95PA0851521MSA R95PA1001521MSA R95PA1151524MSA R802PA050314MSA R802PA075417MSA R802PA100521MSA R802PA125524MSA R802PA150524MSA RGLE-05(-)BMKR RGLE-07(-)AMKR RGLE-07(-)BRQR RGLE-10(-)BRMR RGLE-12(-)ARMR RGPE-05(-)BMKR RGPE-07(-)AMKR RGPE-07(-)BRQR RGPE-10(-)BRMR RGPE-12(-)ARMR

Other Rheem Furnace codes

Code	Meaning
59	Water sensed / blocked drain
60	Blower fault - running (BLWR FLT-RUN)
61	Blower fault - blower not running
66	Blower overspeed (BLOWER OVRSPEED)
68	No blower communication (NO BLWR COMM)
82	Supply air sensor fault (SA SENSOR FLT)
d1	No shared data (NO SHARED DATA)
d4	Memory card invalid (MEM CARD INVALD)
d5	Card/hardware conflict (CARD-HRD CNFLCT)
d6	Blower HP conflict (BLWR HP CNFLCT)
d7	Blower manufacturer conflict (BLWR MFG CNFLCT)
d8	Old shared data (OLD SHARED DATA)

All Rheem Furnace error codes →

Rheem code 93: homeowner questions

What does Rheem code 93 mean?

Internal control fault. Internal furnace control fault. 802P/R95P: hard lockout - internal fault, or voltage on the gas valve contacts (welded relay) that does not clear when the inducer cycles; cycling the heat call will not reset it. RGPE/RGLE: CONTROL FLT…

Is it safe to keep using my furnace with code 93?

No. Code 93 is a safety shutdown, so keep the furnace off until a licensed technician has checked it.

Can I reset Rheem code 93 myself?

Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.

Who can fix Rheem code 93 near me?

Aurora Star Tech Inc. repairs Rheem furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean

Troubleshooting guides

Blowing cold air All brands · Furnace
No heat All brands · Furnace
Short cycling All brands · Furnace
Blower does not start after burners light Rheem · Furnace
Burners go out before the heat call ends / short cycling Rheem · Furnace
Communicating system not found / no communication Rheem · Furnace
ECM blower does not start on heat Rheem · Furnace
Furnace no heat - sequence troubleshooting Rheem · Furnace
Furnace short cycles or does not hold setpoint Rheem · Furnace
Gas valve does not shut off when heat call ends Rheem · Furnace
Indoor blower does not start after burners light Rheem · Furnace
Inducer (draft motor) does not start on heat call Rheem · Furnace
Inducer does not run / does not run on low speed Rheem · Furnace
Inducer runs 60 s then shuts off for 5 minutes, or runs continuously Rheem · Furnace
Inducer runs 60 seconds then off for 5 minutes Rheem · Furnace
No heat - inducer (IDM) does not start Rheem · Furnace
No heat - POWER LED off Rheem · Furnace
Read target airflow from the CFM LED Rheem · Furnace
Thermostat does not hold room temperature Rheem · Furnace

Source: 802P: 92-24161-146-02, Lockout / Diagnostics Flowchart, p.41, 51; R95P: Lockout section, p.88 (PDF p.92); RGPE/RGLE: Table 16 p.49 / Table 20. 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.