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A014_F: Flame Present With Gas Valve Off

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Status

This is an extremely critical fault and should rarely (if ever) be seen in the field.

Description

A flame has been detected when the gas valve has no signal to be open.

Expected Operation

Flame sense shall be monitored at all times. If flame is somehow sensed at a level equal to or greater than the flame cut out threshold for more than four seconds when it is not expected (including standby, cooling and continuous fan operation), the unit will respond as follows:

  1. Gas valve and igniter shall be turned off (if not already turned off). 
  2. Inducer shall immediately be energized at high speed (if not already at high speed).
  3. Indoor blower (IBM) shall immediately turn on. This will normally energize to the highest (100%) heat speed unless there is a cooling call also present – in which case the higher speed shall be used.
  4. “A014_F Flame Present with Gas Valve Off” and “A127_F Flame Present with Gas Valve Off - UL” shall immediately be logged.

These states will remain as described above until the undesired flame is gone.

Once the undesired flame is no longer present, the furnace control clears the alarm "A014_F Flame Present with Gas Valve Off", completes the inducer post-purge and the user set heat blower off delay. The IFC then proceeds to a one-hour “soft” lockout with the alarms "A116_F One-hour Lockout: Flame Presence Alarm" and "A127_F Flame Present with Gas Valve Off - UL" declared throughout the duration. Upon completion of the lockout, IFC clears alarm "A116_F One-hour Lockout: Flame Presence Alarm". UL safety alarm "A127_F Flame Present with Gas Valve Off - UL" remains logged until power is cycled to the unit after which the control shall resume normal operation.

Causes

1. Field Mis-wiring of gas valve.

2. Faulty gas valve relay that is stuck or sticking.

3. Faulty furnace control that is sensing flame when no flame is present.

4.  Flame sense wire is grounded.

5. 24VDC for blower control on the IFC is grounded, check if removing blower harness fixes the fault.

Solution

1. Wire Properly.

2. Replace indoor blower motor if blower motor control is grounding 24VDC on the IFC board.

3. Flame sense wire should be properly connected to flame sense rod and should not be grounded.

4. Replace the furnace control (IFC).