Coleman Furnace: 7 Flashes
A Coleman furnace LED pattern starting with 7 flashes matches 2 documented codes: 7 red flashes, 7 red flashes (CP9C Echelon modulating). Watch the full pattern (short vs. long flashes) to tell them apart — all 2 are explained below.
Code 7 red flashes: The burners failed to light on three trials for ignition, so the control locks out for one hour and then tries again
The burners failed to light on three trials for ignition, so the control locks out for one hour and then tries again.
Manual wording: “7 RED FLASHES: This fault code indicates that the flame could not be established during three trials for ignition... The furnace will lock out for one hour and then restart.”
Documented for: TG8S, TGLS, TG9S, TM8X, TMLX, TM9X, TM8T, TM9T, TM8V, TM9V
Likely causes, most common first
- Gas valve switch left in the OFF position
- Low or no gas pressure
- Faulty gas valve
- Dirty or faulty flame sensor
- Faulty hot surface ignitor
- Loose wires or a burner problem
What you can safely check yourself
- Check that other gas appliances in the house (stove, water heater) still work - if none do, the gas supply is out
- Replace a dirty air filter
- Check the outside vent and intake pipes for blockage
- Cycle the furnace off and on once at the service switch to let it retry
When to call a technician
Anything past confirming you have gas to the house - ignitor, flame sensor, gas valve - is technician work in a live gas compartment.
A Coleman furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installation Manual - Residential Gas Furnace, Models TG9S*MP, GG9S*MP (95.5% AFUE Single Stage Multi-position), 364861-UIM-G-1211 (Johnson Controls Unitary Products (Coleman), TG9S*MP, GG9S*MP 95.5% AFUE single-stage multi-position gas furnaces) · checked 2026-08-25
- Installation Manual - Residential Gas Furnace, Models TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP (Single Stage Multi-position / Low NOx), 356485-UIM-G-1211 (Johnson Controls Unitary Products (Coleman), TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP 80% AFUE single-stage gas furnaces) · checked 2026-08-25
- Installation Manual - Residential Gas Furnace, Models TM8X*MP, TMLX*MP (Single Stage Multi-position / Low NOx with High-Efficiency Motors), 437642-UIM-F-1211 (Johnson Controls Unitary Products (Coleman), TM8X*MP, TMLX*MP 80% AFUE single-stage gas furnaces with high-efficiency motors) · checked 2026-08-25
- Installation Manual - Residential Gas Furnace, Models TM9V*MP (Two Stage Variable Speed ECM), 701379-UIM-B-1211 (Johnson Controls Unitary Products (Coleman), TM9V*MP two-stage variable-speed ECM gas furnaces) · checked 2026-08-25
Code 7 red flashes (CP9C Echelon modulating): Lockout due to no ignition
Lockout due to no ignition. The control tried three times to light the burners and failed, so it locks out for one hour and then tries again.
Manual wording: “Seven Red Flashes - Lockout due to no ignition. The control will try three times for ignition. If flame cannot be established in three tries, the control will lockout for one hour and then will try again to light.”
Documented for: CP9C Echelon modulating furnaces
Likely causes, most common first
- No or low gas supply
- Failed hot surface ignitor
- Faulty gas valve
- Dirty or faulty flame sensor
What you can safely check yourself
- Check that other gas appliances in the house still work
- Replace a dirty air filter
- Check the outside vent and intake pipes for blockage
- Cycle the furnace off and on once at the service switch to let it retry
When to call a technician
Ignitor, flame sensor and gas valve work all happen inside the live gas compartment. Call a technician.
A Coleman furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Installation Manual - Residential Gas Furnace with ECM Motor, Models TP9C*C, YP9C*C, CP9C*C, LP9C*C (Up to 98% Modulating Multi-position), 681292-UIM-B-1211 (Johnson Controls Unitary Products (Coleman), CP9C*C Coleman Echelon modulating gas furnace (manual also covers the identical TP9C, YP9C and LP9C chassis)) · checked 2026-08-25
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