Coleman Furnace 7 Red Flashes (CP9C Echelon Modulating)
Soft lockoutShown as: Seven red flashes, two-second pause, repeating
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