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Reznor ft60 Fan not coming and limit shuts off burners

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

shastalaker7
  • 1515 Answers

SOURCE: burner lights but limit switch will not turn fan

Hi, Yes, you have the answer to you're problem. Now, I don't no if you have just a high limit, or a combination Limit control? I will go with the combination fan control as when they go bad, they stick in the closed position and they have normally open contacts. When the heat exchanger starts to heat on a call for heat, there is a dial on the fan control with temp. settings on it , and it will start to rotate as the heat gets higher. When it reaches its set fan on temp, it with start the fan.We no the fan works so the blower is good, so it shuts the burners down on you're high limit temp. which is factory set to about 250*F. When you turn The t-stat from auto to on in the fan side, that solves the problem temp, only. You will need to R & R the Fan control. If you need some direction on doing this please let me know and if it is a Honeywell auto/on type that is rectangular in looks, and if you remove the cover you will see the temp. dial with arrows on it. Thank you.
Best of Luck, and Sincerely,
Shastalaker7


Posted on Nov 21, 2009

  • 79 Answers

SOURCE: main blower stays on, burner fan on intermitantly,

All gas furnaces have a fan control of some sort. Either a mechanical fan control where there is a temperature probe that reaches into the heat exchanger compartment thru a hole in the panel that separates the control part of the furnace(this would be the front of the furnace where all the controls are) from the heat exchanger. This type of control is either a small black plastic control about 4 inches by 2 inches and about 1 1/2 inches thick secured to the panel with 2 screws. Or it is a slightly larger silver colored control that should have a pull off cover. It may say Honeywell on it. Either way the control will need replacing.
The other type of fan control is a solid state control board. This will most likely be located in the indoor fan compartment. It should be located under a covered control box. The box with all the wires going into it. This board will also need to be replaced if your furnace uses this type of fan control. You will need to bring your furnace model and serial number to a dealer that sells your brand of furnace or go online to a parts dealer that carries parts for your furnace. Hope I was of help to you! Good luck!

Posted on Nov 28, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: t-stat turns gas valve on,burner lightsburns long

Probable causes include crack in heat exchanger, dirty pilot, bad high limit switch or bad gas valve. A crack can allow the fan to blow the flame off of the thermocouple or flame sensor. A dirty pilot will cause the same effect. The bad limit switch could cycle the system and a bad gas valve could be shutting off gas supply to unit.

Posted on Dec 03, 2009

  • 59 Answers

SOURCE: My cozy counterflow wall furnace burner comes on,

by pass the wall thermostat twist the wires together if unit runs and fan comes on the stat is the problem.

Posted on Oct 22, 2010

heatman101
  • 43501 Answers

SOURCE: main burner comes on and

Hi,
There could be a couple of different things happening...
The most likely is that the high limit switch is bad and the flame causes it to bring on the blower and then shuts the flame down also...this could be because the high limit is bad or because the vent is blocked and the flue gases are not venting...

Could also be a bad/dirty flame sensor, but that is not as likely...

I would checkout the high limit and find out what is going on there...

heatman101

Posted on Feb 02, 2011

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i have an ole reznor in my garage been workiing for ten + years no problems , mine is gas , the pilot light does go out after it switches to main burner like ten seconds later , but does light back up when thermostat shuts main off ( i had to go look to make sure) not a real big flame maybe like an inch or so , has a spoon shaped air shield around it , maybe yoours is missing ?

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Hi,
It appears to be the fan limiter switch. It comes on at a certain temp when heating up and shuts off on the high end of its setting. Once the burners are shut down, the fan continues for a few minutes to cool down the burners. The limiter switch is adjustable but it sounds to me to be defective and should be replaced. Good luck and stay warm, :-)

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Hi, sounds like you have a problem with the heat anticipator in the thermostat. If you replaced the fan limit, and with it running that long after the burners shut down, it would be in your stat. If it fires up after resetting breaker, was the stat set to call for heat? If not, the stat is faulty. If you remove the front to get to the stat wires, take a jumper wire and jump from RH or RC to W. Heat will start. Let it run for a minute or so and remove wire. If the fan shuts down with in a min. or so, you will know it was the stat. Good Luck and let me know the out come!
Shastalaker7
A/C, & Heating Contractor

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1 Answer

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