Furnace flashing an error code?

KEEPRITE, Tempstar and ICP branded furnace codes

If you’re looking for help fixing your Keeprite Tempstar furnace, look no further than experts that the manufacturer refers to us as Elite.

It is ‘always’ best practice to have a licensed technician complete a thorough assessment, however it is good to know what you are looking at for the reason you have “no heat”.

CODE: Heartbeat LED pattern on solid (on and off in steady pattern). 

ISSUE: The control is locked out and will auto-reset after 1 hour. 

FIX: Reset power to clear the lockout.

CODE: Two LED flashes. (2 Flashes)

ISSUE: Pressure switch didn’t open. 

FIX: Obstructed pressure tubing; a pressure switch that’s stuck closed. Could be something blocking the venting, maybe check outside to see if anything by accident was leaned against the intake/exhaust.  If it persists call a technician.

CODE: Three LED flashes. (3 Flashes)

ISSUE: The low-pressure switch did not close or has reopened. 

FIX: Proper vent sizing; air leak; restricted vent; clogged condensate drain; low input gas pressure; excessive wind; improper pressure switch wiring; water in vent piping; disconnected or obstructed pressure tubing.  Could be something blocking the venting, maybe check outside to see if anything by accident was leaned against the intake/exhaust.  If it persists call a technician.

CODE: Four LED flashes (4 Flashes)

ISSUE: Limit circuit fault. 

FIX: Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch. This one is best to have a licensed technician look it over, if not a clogged or very dirty filter it can lead to much larger issues.

CODE: Five LED flashes.  (5 Flashes)

ISSUE: Abnormal flame-proving signal. 

FIX: Leaky gas valve; stuck-open gas valve.  Best to have a licensed technician look this over.

CODE: Six LED flashes. (6 Flashes)

ISSUE: Ignition proving a failure. 

FIX: Low inlet gas pressure; control ground continuity; gas valve defect; defective hot surface igniter; oxide buildup on the flame sensor; inadequate flame carryover; flame sensor mustn’t be grounded.  Best to have a licensed technician look this over.

CODE: Seven LED flashes. (7 Flashes)

ISSUE: Limit circuit lockout. 

FIX: Control will auto-reset after 3 hours. Refer to status code #4.

CODE: Eight LED flashes. (8 Flashes)

ISSUE: Gas heating lockout. 

FIX: Gas valve stuck closed on control.  Best to have a licensed technician look this over.

CODE: Nine LED flashes. (9 Flashes)

ISSUE: Medium pressure switch, high-pressure switch, or PSR relay didn’t close or was reopened. 

FIX: Refer to status code #3.

CODE: Ten LED flashes. (10 Flashes)

ISSUE: Polarity. 

FIX: Correct line voltage polarity, could also have burnt wiring harness inside the furnace, burnt a spot on the circuit board.  Best to have a licensed technician look this over.

CODE: Status codes 1 + 2. 

ISSUE: Blower on after power up. 

FIX: Normal operation.

CODE: Status codes 1 + 5. 

ISSUE: Blower motor lockout. 

FIX: Control will auto-reset after 3 hours. Refer to status code #4 + 1.

CODE: Status codes 3 + 5. 

ISSUE: Gas valve fault. 

FIX: RED, YELLOW, or ORANGE wire at the gas valve.

CODE: Status codes 4 + 1. 

ISSUE: Blower motor fault. 

FIX: Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits.

CODE: Status codes 4 + 2. 

ISSUE: Inducer motor fault. 

FIX: Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly.

CODE: Status codes 4 + 3. 

ISSUE: The low or medium pressure switch is open while the medium or high-pressure switch is closed. 

FIX: Low inlet gas pressure; clogged condensate drain; improper pressure switch wiring; water in vent piping; low or medium pressure switch stuck open; disconnected or obstructed pressure tubing.

CODE: Status codes 6 + 1. 

ISSUE: Ignition lockout. 

FIX: Control will auto-reset after 3 hours. Refer to status code #6.

Tasks to Leave to a Furnace Repair Expert

When troubleshooting your furnace doesn’t solve your heating issues, never hesitate to contact a trained HVAC contractor. Any furnace, regardless of its age, may pose combustion- or gas-related safety hazards, so it’s always a good idea to have an expert examine the unit and suggest the best course of action.