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Why does furnace run fine but after 20 mins shuts down and won't restart, though it hasn't reached thermostat call. Switch off manually and back on it will run fine again but no restart. 3 flash code

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  • Heating & Co... Master
  • 2,458 Answers

3 code in the pressure switch

Posted on Dec 18, 2016

  • Roger Glatzhofer
    Roger Glatzhofer Dec 19, 2016

    Thanks Paul but the inducer motor just locked up and after freeing it a bit, it was still too stiff for it to operste. Noticed codes 3 flashing nonetheless. Apparently it was intermittently overheating and seizing causing early turn off of furnace and inability of pressure switch to do its job. It's 35 years old so new furnace is what's needed. Hope we can make it through the next few freezing days without bursting water pipes. Thanks for your help

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6 Suggested Answers

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Posted on Jan 02, 2017

Therinnaiguy
  • 1420 Answers

SOURCE: furnace won't stay running

1
1 FLASH
Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
sensor.
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
performance.
• Locate and correct gas
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
igniter.
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
• Verify proper induced
draft blower performance.

Posted on Nov 25, 2008

mrgrzz
  • 88 Answers

SOURCE: furnace blower not working how it should

first off buy yourself a honeywell stat, in my personal opinion lux stats are garbage, I have run into so many that are bad stats !!! but as far as your fan not shuting down, sounds to me like your fan center on your circuit board is bad and will not shut down the fan when needed, you will have to replace the circuit board, as the fan center is a part of the whole of the circuit board, hope that helps

Posted on Jan 20, 2009

  • 230 Answers

SOURCE: My furnace shuts off sometimes after the first 20-30 seconds.

The two most common reasons I have found for this are listed below. You have already addressed the third one.

1) Grounding issue. This can be difficult to find but easy to diagnose. Try using a volt meter or even just a piece of wire. Touch one end to an unpainted surface of the interior furnace cabinet and the other end to the sheet metal plenum or other ground. If the symptoms go away then you have diagnosed the problem and need to find the faulty ground.

2) Pressure in the flu. Check to make sure that the flu vent pipe is not clogged or even partially filled with debris. The small rubber hose that connects to the switch from the inducer blower motor may be clogged. Also check the orifice on the inducer motor side. You can clear this with a paper clip. Water (condensation) in the inducer motor housing or pressure switch can cause a failure too. Rarely is the pressure switch itself bad. This usually will only happen if it has been physically damaged or soaked. Best of luck.

Posted on Jan 29, 2009

  • 1033 Answers

SOURCE: Gas furnace with Honeywell smart valve code error

Hello, it sounds like your Furnace might be shutting off due to your high limit switch.A limit switch will open when the furnace overheats due to low airflow, . check air filter, clean blower wheel, and check to make sure the blower wheel is running at proper speed and not dragging sometimes cause by a weak capacitor. Anything that restricts airflow will cause a limit switch to open.

Posted on Mar 08, 2011

  • 2 Answers

SOURCE: furnace wont start when thermostat sends signal

bad primary control (the box with the reset button), maybe your thermostat but unlikely. Try the Primary Control first. How old is your burner?

Posted on Dec 14, 2012

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