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I have a dayton fuel trimmer Model# 3E371D hanging furnace. when you give it a signal it fires up the fan kicks on and the unit will run 10-15 min and then before reaching the set point on the thermometer the fan kicks off but the burners stay on and you have to shut the thermostat off or the high heat switch will trip. After waiting 10-15 min and turning the thermostat back on the unit will fire and run perfectly for another 10-15 minutes before repeating the cycle. Any help would be appreciated.

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: FURNACE CYCLING ON AND OFF ..

it sounds like you have a dirty or faulty flame sensor im assuming that you have inshot burners in your furnace the flame sensor will be on the right or the left of the burner assembly opposite the pilot and ignitor it slip through the burner assembly and attaches to the burner it is l shaped steel that is fitted in a porcelin housing and when installed correctly it will be directly in front of one of the inshot burners when the main burner lites the flame touches the sensor and holds the gas valve open until the thermostat is satisfied remove it and sand the the l shaped metal end with 100 grit sandpaper until its clean and shinney then reinstall set thermostat to heat and see if it will stay lit if not get furnace brand model and serial# go to local hvac parts house and pick a new flame sensor if its a rheem i generally pay about ten dollars each my cost chances are cleaning will take care of the problem. good luck! hvac ike

Posted on Jan 20, 2009

shastalaker7
  • 1515 Answers

SOURCE: no heat coming from furnace,

Hi, this unit if you say hot surface ignitor has no standing pilot for you to light. Yes, the fan will run in the on position. Turn it back to auto. Leave it off. You will need 2 people, this will be easier for you. Go to the furnace and see if you have a round inspection hole to look through. If so, see if you see a red led light. Yes or know. Remove the panel to where you can see the circuit board, burners lined up and so on. Some units have a panel switch on them so when you remove the panel, it kills power to everything. It would be around the perimeter and you will need to tape it down real good. Now, have someone turn the thermostat to auto/heat and turn the heat up high. I know this is a Carrier with a hot surface ignitor, so you should be hearing the small inducer motor start running. If you did have a red led light and it is flashing, you will have a code sheet glued to the panel, a error sheet to tell you what is wrong, like if its flashing 3 times fast and 1 time long and slow you would look at chart and it will say what to look for. Some units have them and some don't.Anyway, the inducer motor comes on first, it has a clear plastic tube coming from it going to a pressure switch. If the motor is on and the tube is clean, no water, condensation in it, it goes to the switch and closes the switch.When it closes, it will send a command to the main controller, circuit board or a module to send power to the hot surface ignitor, which will glow and send a signal back to open the pilot valve(PV). There is a porcelin flame sensor next to the ignitor that has a metal tip which heats up and tells the main gas valve the pilot is on to open up and send gas from the 1st burner over to the 2nd and so on. This is the sequence of operation. We know the stat is good, and the blower motor is also good, so all we need to do is find out why the furnace wont light and run. It may have a flame roll out switch on it that has tripped. It has a reset button on it. Make sure the gas valve and gas is on before you do this test I am walking you through. Try to have a helper. Remember the door switch if it has one. This should be a easy fix, so get back to me and keep me posted on what is going on. I will wait to hear from you. You can do this.
The best to you,
Shastalaker7

Posted on Apr 11, 2010

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