Problems with York Diamond 80 Furnace

The furnace will fire up properly and run with the blower for about 1 minute at which time the blower will turn off but the burners stay on after a short period of time the blower will turn back on and run for a short period of time and the burner may go off during this time period. It runs with these very short cycles for hours until the temperature is reached. The model # is P1CKD16No9601A.
When I looked at the control module I sometimes get a 4 flashing error which says it is an open limit error.
I have tried running the furnace with all the vents open, some of the vents open. The filter out of the return air and the bottom pannel open on the unit. It doesn't seem to matter it just runs in short cycles.
Does anyone have any suggestions what may be the issue?

 

If you have A/C, the evaporator coil may be clogged reducing the amount of air which can flow thru it & causing the furnace to overheat. Another & better possibility is a bad fan motor or fan control. Do you have a voltmeter & know how to use it?

 

I 2nd what Grady says.

If the flame is still going, this essentially means almost all functions of the furnace are still a go: Thermostat still calling for heat and all the safety switches are closed as they should be. Nothing wrong.

The fact that the blower goes out means the temp inside the furnace is coming DOWN. Down below the cut out temp. This phenomenon can occur in houses where someone had the heat shut off and it got like 35 in the house or something. Then when they go to run the furnace, the furnace fires and heats up the way it should, and then when the fan goes to blow warm air out the registers, the air the blower is blowing is also sucking IN the cold return air which lowers the temp in the heat exchanger.

So then the blower shuts off unil the fire builds up enough heat again in the exhanger to cause the blower to come on for a while. In this scenario, with a cold house, you will find that as time goes on, the actual time that the blower shuts off becomes less and less, until finally when the house temp gets up to say 50 or more degrees, then the cold return air is no longer cold enough to cause the problem anymore.

IF your house is not THAT cold, either you have to adjust that cut-out setting of the fan switch or if it is defective, replace it.

Hope the lengthy explanation helps your understanding of this matter.

 

Grady,

I can get a voltmeter to use.
What and where should I be checking the volatge?
Also what about the led blinking 4 times what is that about?
Also if I turn the fan on at the thermostat it does not run.

 

If there are fan terminals on the control board, check from the one marked "heat" (or something like that) & a neutral. This should be done both with the fan running & not running with the furnace hot. You are looking for 120 volts.