Question about Reddy R155D Utility Heater

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The fan comes on but the burner won't kick on and then shuts off

Last time I used it the heater would run a litte bit shut off , a minute later turn back on did that a few times and then blew a big puff of smoke. now plug it in the fan turns on but the burner won't kick on and it shuts back off.

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  • 92 Answers

Check your fuel line for cracks and also the air line. Most likely is the CAD flame sensor, easy to change and only 3 bucks or so. Might also want to check all of your filters. Mine was doing the same thing and it was the high heat limit control and the flame sensor.

Posted on Jan 22, 2009

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Posted on Jan 02, 2017

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1999 Goodman down draft natural gas furnace. It starts as normal, the burners fire and it warms up, but the blower doesn't start, after a couple minutes the burners shut down and the blower immediently...


IT SOUNDS LIKE THE FAN CYCLE RELAY OR BOARD IS NOT MAKING THE FAN COME ON WHEN IT SHOULD THE BURNER SHUTS OFF PROBABLY BECAUSE IT REACHES THE HIGH LIMIT.

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Hi, I have a Dayton 3ug73 heater. The heater will not shut down after the initial heat requirement is met. I have the thermostat set on low but it continues to heat. I shut the power off to it to keep...


It sounds to me like your thermostat may be bad. I would check power incoming to t-stat then turn temp. setting up and down to see if it is switching on and off. If not then replace. If it does then I would check all wiring to gas valve and if power is shutting off to valve but burner continues then replace gas valve. Thank you.

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Our furnace seems to run on idle constantly . we are using more oil but not electric if i tap on the box it stops but starts again a few minutes later??


We need to get a few details cleared up:

Is it the Furnace (Oil burner) that is running, (on idle you called it..)
or is it the FAN that is running?
What are you tapping, that shuts off what?
Is the fan that blows the air around the home shutting off, or the burner?
(When the burner is running, there is a loud roar!-- the fan should be much quieter..)

If it is the fan that is running,-- I might ask, is the air coming from the registers too cold?-- for with the fan running, you are getting all the heat from the oil that was burned. But naturally, you don't want it to be uncomfortable.. So-- you can open the cover on that Fan control switch, and raise the temperature at which the fan turns ON and OFF..

Let us know what you find.

Mack B

Dec 28, 2010 | Heating & Cooling

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Sounds like the low limit or high limit is out these control the fan motor.They are usually set to kick on around 150 degrees and set to go off around 95 to 100 degrees. Over heating does happen with cracked heat exchangers and it can possibly take these two items out. Normally your furnace should run approximately five minutes or a little less then your fan motor comes on and then for cooling down burners should drop and the fan motor should run again roughly five minutes or so then shut down. Times may vary as to your settings.

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Dayton 3E227A Heating Cycle


The sensor for the thermostat is probably going bad or has bad connections. It is (or thinks it is) heating up fast and therefore shuts of the heater.

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