A228_F: Internal Fault: Gas Vlv Rly 2 Stuck Open
Status
This is a critical fault and should rarely (if ever) be seen in the field.
Description
High gas valve relay on 2-stage is stuck open causing ignition failures.
Expected Operation
If the gas valve relay is energized for ignition trial and the internal sensing circuit detects that there is no voltage on the gas valve output and flame is not established after four ignition tries, the gas valve will be de-energized and inducer will run through post-purge. The control will enter a 1-hour lockout with alarm "A113_F One-hour Lockout: Ignition Failure" declared together with "A228_F Internal Fault: Gas Vlv 2 Rly Stuck Open".
After the lockout is complete, the furnace clears alarms "A113_F One-hour Lockout: Ignition Failure" and "A228_F Internal Fault: Gas Vlv 2 Rly Stuck Open". The control then resumes normal operation.
Cause
Faulty furnace control - relay stuck open.
Solution
Replace furnace control (IFC).
