Troubleshooting Gas Furnace


  #1  
Old 02-28-14, 03:16 AM
J
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Question Troubleshooting Gas Furnace

Model# 58SSC075-GC
Series 100

The Problem:
When I call for heat from the tstat, the inducer motor kicks on and runs continuously. Ignitor does not glow. There is kind of a squealing sound coming from the inducer fan. I think rarely changing the air filter caused the problem.

When the tstat is off and I switch the fan to On, the blower does come On.

Ignitor is good.
Replaced Control Board - ICM281 Carrier Bryant CESO110057 Control Circuit Board.
Replaced Flame Roll-out Switch -Part# 18HA350 with 18HA449 (replacement part).
Replaced Limit Control Switch -Part #HH12ZA176A L170-40F.

Error 31:
-Proper vent sizing and condensate pitch or sag.
-Defective inducer motor or start compacitor.
-Vent restriction or high winds.
-Defective pressure switch or connection. If it opens after trial for ignition period, blower will come on for 90 seconds recycle delay.
-Inadequate combustion air supply.
-Disconnected or obstructed pressure tubing.
-Low inducer voltage

Checked voltage to inducer, 124V
 
  #2  
Old 02-28-14, 09:05 AM
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Error 31:
-Proper vent sizing and condensate pitch or sag. Unlikely unless this is a new installation.


-Defective inducer motor or start compacitor
. (Capacitor) Possible but not the most likely.


-Vent restriction or high winds. Easy to check. See if any bugs, birds or other critters have set up housekeeping in either the combustion air intake piping or the exhaust piping.


-Defective pressure switch or connection. If it opens after trial for ignition period, blower will come on for 90 seconds recycle delay.
Highest probability, especially the connections. Pressure switches themselves rarely fail but the connecting tubes can crack and leak air or fill with condensed water. The nipple where the tubing connects to the induced draft fan or combustion chamber can easily become corroded internally to the point of not allowing the pressure change to actuate the switch.


-Inadequate combustion air supply.
Highly unlikely unless a new installation. Check for obstructions in the combustion air piping.


-Disconnected or obstructed pressure tubing. See Defective pressure switch.

The squealing of the induced draft fan is from a bearing problem. Most likely you will need to change out the fan motor at the very least and perhaps the entire fan depending on the availability of parts and their cost. This was NOT a result of infrequent air filter changes. IF the fan had oiling places (most do not) then it could be from a lack of routine maintenance.
 
 

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