R - A 6
Alert Code Response
Error 22: Soft lock-out due to flame loss or
ignition retries
Comfort Control = Err 22
User Interface = RECYCLE LO
Furnace Fault LED = 2 Flash
Problem Description
• 10 burner recycles within a single call for heat
• Burners ignite and flame sensor circuit is proven then
flame drops out
Possible Causes/Solutions
• Gas valve solenoid failing
• Inlet gas pressure dropping to low
- Gas pressure regulator failing
- Debris in gas valve screen or blockage in supply line
• Air impingement on burners or flame
Error 18: Control failure
Comfort Control = Err 18
User Interface = No Alert Displayed
Outdoor Unit Fault LED = 18 Flash
Problem Description
• (16 & 20 SEER Only) 24 volts not sensed at Y1 input of
J1 connector on outdoor control board
- The Y1 input is monitored to sense very short power
interruptions that could cause compressor short
cycling
Possible Causes/Solutions
• Faulty or missing “Y1” input into J1 connector on
out door control board
• Verify red wire to top center pin of J1 connector is
delivering 24vac to outdoor control board
Error 18: Control failure
Comfort Control = Err 18
User Interface = No Alert Displayed
Air Cleaner Fault LED = YEL-2, 3 & 4 ON;
RED-1 ON, 2 & 3 OFF
Problem Description
• Internal control lockout within air cleaner
Possible Causes/Solutions
• Re-power air cleaner; if fault does not clear replace
the power door
• Failure could be caused by line voltage spikes or
electrostatic discharge
Error 22: Soft lock-out due to flame loss or
ignition retries
Comfort Control = Err 22
User Interface = RETRY LO
Furnace Fault LED = 2 Flash
Problem Description
• 3 ignition attempts in a row without proving flame within
a single call for heat
Possible Causes/Solutions
• Flame sensor not sensing flame (less than one
microamp)
• Inlet/outlet gas pressure too high or low
• Flame sensor not positioned properly in flame
• Burner crossovers not aligned properly or restricted
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