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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a keep rite furnace that stopped working - 4

Customer Question

I have a keep rite furnace that stopped working - 4 flashes-first now 7
Submitted: 10 months ago.
Category: HVAC
Expert:  Kcrand36 replied 10 months ago.

Good Morning. I am Kevin, one of the tech's here on JA.

Can I get the model number of your furnace?

Customer: replied 10 months ago.
It's a keep rite can't see model
Expert:  Kcrand36 replied 10 months ago.

you should find that label in the burner compartment

Customer: replied 10 months ago.
There is a model no on the panel 330713-101
Expert:  Kcrand36 replied 10 months ago.

there should be a letter, number then three letters. such as g9mae,n9mse.

Customer: replied 10 months ago.
There is c9mvx10020a on a yellow label
Expert:  Kcrand36 replied 10 months ago.

is there a pattern with short flashes, followed by a pattern of long flashes? If so, can you read those?

Customer: replied 10 months ago.
It is 4 flashes
Customer: replied 10 months ago.
Which says limit or roll out switch open
Customer: replied 10 months ago.
The furnace does light but after about 5 mins this error (4 flashes) and then shuts off
Expert:  Kcrand36 replied 10 months ago.

ok, in the burner compartment, with the service switch to the furnace shut off, I want you to find a small device with two wires connected to it. There may be two of these, they are usually located "just above the burners" where you can see flame. In between these two wires maybe a reset if it is a manual reset. See if you can locate these. I cannot tell you much without a good model number, the c9, doesn't show me anything either.

Customer: replied 10 months ago.
Found one sensor above right of burners and one similar to the left and below burners
Customer: replied 10 months ago.
Seems to some sort of switch between wires -pressed that
Expert:  Kcrand36 replied 10 months ago.

did you get a click or anything when you depress the button in the center between the wires?

Customer: replied 10 months ago.
Also still looking for model no inside- nothing-have the manual but appears to be generic for *9m models
Customer: replied 10 months ago.
No click I didn't force. It - but no spring. Action
Expert:  Kcrand36 replied 10 months ago.

have you retried the furnace?

Customer: replied 10 months ago.
I can see exhaust fumes going outside
Customer: replied 10 months ago.
Just trying furnace, again
Expert:  Kcrand36 replied 10 months ago.

so we have ignition?

Customer: replied 10 months ago.
but will have to see if it stays
Expert:  Kcrand36 replied 10 months ago.

have you had very high winds?

Customer: replied 10 months ago.
Ok same deal - stopped with 4 blinks
Customer: replied 10 months ago.
No
Expert:  Kcrand36 replied 10 months ago.

is your blower running at all?

Customer: replied 10 months ago.
but it stops
Expert:  Kcrand36 replied 10 months ago.

do you have a "fan on switch" on the thermostat?

Customer: replied 10 months ago.
set to auto
Expert:  Kcrand36 replied 10 months ago.

turn to on, and allow to run, does the blower continue to run without any problem?

Customer: replied 10 months ago.
How do I know that??
Customer: replied 10 months ago.
Not hearing anything
Expert:  Kcrand36 replied 10 months ago.

do you have air conditioning as well?

Customer: replied 10 months ago.
Expert:  Kcrand36 replied 10 months ago.

ok, with the fan switch on the thermostat in the "on" position, you should have air blowing from the vent's.

Customer: replied 10 months ago.
Don't seem to getting anything
Customer: replied 10 months ago.
Also turn ac on with thermostat set to lower temp and nothing happened
Expert:  Kcrand36 replied 10 months ago.

ok, this could be your problem. We need to go to the furnace now. problem is in the furnace, most likely in the blower circuit.

Customer: replied 10 months ago.
Ok
Customer: replied 10 months ago.
There now
Expert:  Kcrand36 replied 10 months ago.

do you have a service switch on the side of the furnace?

Customer: replied 10 months ago.
I have turned it off
Expert:  Kcrand36 replied 10 months ago.

great, remove bottom panel...........

accessing the blower compartment

Customer: replied 10 months ago.
Done
Expert:  Kcrand36 replied 10 months ago.

carefully, place your hand near the motor (follow the wires going to the blower motor), if you start feeling heat, don't get any closer, but if you don't see if you can touch the motor...... is it hot?

Customer: replied 10 months ago.
Cold
Expert:  Kcrand36 replied 10 months ago.

then now we need a volt meter to test....... do you have one or do you have a friend that has one, and knows how to use?

Customer: replied 10 months ago.
I don't have one- but this sounds like it is going territory beyond me...
Expert:  Kcrand36 replied 10 months ago.

It sounds to me like you have a defective relay on your circuit board. what needs to happen on these boards, is a call for heat, (low voltage section through limit switches, high limits, pressure switches), back to the board to send power to the gas valve. All this is usually a "timed cycle", after that "timed cycle" has been reached, a relay on the board, turns "high voltage" power to the fan motor. This does not appear to be happening based on what you are telling me. The blower motor is not running. This will trip the high limit in the circuit, and never allow the home to heat, because you are not moving air over the heat exchanger.