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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
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: 1 year ago.
Category: HVAC
Expert:  Kcrand36 replied 1 year 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 1 year ago.
It's a keep rite can't see model
Expert:  Kcrand36 replied 1 year ago.

you should find that label in the burner compartment

Customer: replied 1 year ago.
There is a model no on the panel 330713-101
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
There is c9mvx10020a on a yellow label
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
It is 4 flashes
Customer: replied 1 year ago.
Which says limit or roll out switch open
Customer: replied 1 year ago.
The furnace does light but after about 5 mins this error (4 flashes) and then shuts off
Expert:  Kcrand36 replied 1 year 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 1 year ago.
Found one sensor above right of burners and one similar to the left and below burners
Customer: replied 1 year ago.
Seems to some sort of switch between wires -pressed that
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
Also still looking for model no inside- nothing-have the manual but appears to be generic for *9m models
Customer: replied 1 year ago.
No click I didn't force. It - but no spring. Action
Expert:  Kcrand36 replied 1 year ago.

have you retried the furnace?

Customer: replied 1 year ago.
I can see exhaust fumes going outside
Customer: replied 1 year ago.
Just trying furnace, again
Expert:  Kcrand36 replied 1 year ago.

so we have ignition?

Customer: replied 1 year ago.
but will have to see if it stays
Expert:  Kcrand36 replied 1 year ago.

have you had very high winds?

Customer: replied 1 year ago.
Ok same deal - stopped with 4 blinks
Customer: replied 1 year ago.
No
Expert:  Kcrand36 replied 1 year ago.

is your blower running at all?

Customer: replied 1 year ago.
but it stops
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
set to auto
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
How do I know that??
Customer: replied 1 year ago.
Not hearing anything
Expert:  Kcrand36 replied 1 year ago.

do you have air conditioning as well?

Customer: replied 1 year ago.
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
Don't seem to getting anything
Customer: replied 1 year ago.
Also turn ac on with thermostat set to lower temp and nothing happened
Expert:  Kcrand36 replied 1 year 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 1 year ago.
Ok
Customer: replied 1 year ago.
There now
Expert:  Kcrand36 replied 1 year ago.

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

Customer: replied 1 year ago.
I have turned it off
Expert:  Kcrand36 replied 1 year ago.

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

accessing the blower compartment

Customer: replied 1 year ago.
Done
Expert:  Kcrand36 replied 1 year 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 1 year ago.
Cold
Expert:  Kcrand36 replied 1 year 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 1 year ago.
I don't have one- but this sounds like it is going territory beyond me...
Expert:  Kcrand36 replied 1 year 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.