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Old 04-04-2011, 11:56 PM   #1
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I am getting an 4 flash error code. However the big blower is not Firing up after furnace gets hot. what do i do?

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Old 04-05-2011, 12:03 AM   #2
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I am getting an 4 flash error code. However the big blower is not Firing up after furnace gets hot. what do i do?

What does the 4 flash code mean, exactly?

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Old 04-05-2011, 12:15 AM   #3
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thermal protection device open. however the furnace still lights. but the big blower does not come on to force the hot air to the rest of the house. The little fan then trips after about a min. of running and gas turns off and i get the 4 flashing error code.

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Old 04-05-2011, 07:51 AM   #4
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I'm not certain of this but it could be 1.) the blower motor is going out (check for proper voltage at control board taps and at motor while in call for heat) 2.) the run capacitor for the blower motor is out (check against data on cap in mfd) and/or, 3.) the flame sensor is not detecting a flame which would mean the flame sensor is dirty or bad (if continuity is present through wires to sensor), 4.) faulty or stuck open high temperature limit switch

1. and 2. are just to make certain the blower and control board and run cap are good and the signal and voltage for the blower to come on is present.

I realize you said thermal switch but anything could be possible so if it were me I'd start with the most basics of process of elimination.
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Old 04-05-2011, 03:26 PM   #5
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I'll let you know of what happens when i get home. I do believe it is the blower motor.
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Old 04-05-2011, 03:40 PM   #6
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I'll let you know of what happens when i get home. I do believe it is the blower motor.
Get all numbers from the motor if it is bad such as the horsepower (1/3, 1/4, 1/2 hp) and voltage (115, 120, 230 or 240 volts) as well as the brand, model and serial numbers so you can get an exact replacement. New brand is neither here nor there, horsepower and voltage is mandatory. Make certain you know the rotation of the motor as well before you take it out. Not a big deal to switch rotational direction if the motor is bi-directional and they usually all are.

Always turn the power off to the unit when working on anything.

Also it is good practice to change the run cap at the same time as the motor replacement.

Let us know if you have any further questions and we'll be glad to help.
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Old 04-06-2011, 03:24 AM   #7
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Yeah fan is probably dead and trips the limit without air flow. I would change the capacitor out first before you do the blower motor, sometimes you get lucky.

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