Maximum Number of Retries Detected
Burner is either not lighting or not staying lit during ignition cycle. Check inlet gas pressure for minimum pressure on rating label. Can you hear sparking to the burner? Check high voltage cable connections. Check inlet gas pressure to the gas valve making sure the pressure is within the limits specified on the rating label. Check gas valve wire harness for broken wires or shorts. Check outlet gas pressure. If 24 volts is present to the terminals at the gas valve, replace gas valve. Check for voltage output to the blue gas valve wires on the control board pins. If during the ignition trial period, there is no voltage resent at the control board pin terminals for the blue wires leading to the gas valve, then replace the control board. Replace spark rod if insulator is damaged or rod is loose. Check to make sure combustion blower is operating when thermostat calls for heat. If blower is not running check for 120 volts to blower harness and then at blower pin connections. Replace control, wire harness, or blower if defective. Check to make sure vent terminals are clear of debris or snow and ice. Make sure the condensate drain flows freely.
