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Old 12-05-2023, 02:58 PM   #1
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Jayco furnace trouble

we have a jayco jayflight 21ft, and the furnace stopped working and is displaying a single flash 3 sec, code . so I replaced the limit switch ,that didn't work so I changed sail switch and the furnace is still flashing the same code and wont run at all. i think the only thing left is the circuit board . Can anyone please give me some advise,I would appreciate it very much . Our local rv dealer is charging 200 per hour so I'm trying to fix it myself
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Old 12-05-2023, 08:13 PM   #2
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What is the manufacturer of the furnace, what is it doing if anything at all? Does the fan run?
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Old 12-05-2023, 09:18 PM   #3
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Not knowing the brand and model number of your furnace, we can only generalize some ideas that may work.

If you haven't done so already, try the reset switch on the furnace. A sensor may have gone bad or detected an unsafe condition and locked out the furnace. If you decide to replace the board, get one from Dinosaur. They're the best you can buy.

Also make sure all the wiring connections are tight.
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Old 12-05-2023, 11:03 PM   #4
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I did some online research and see that you apparently have an Atwood furnace and that the 3 flashes does indicate a high limit switch problem. Since you replaced this component, the problem is "most likely" somewhere else.

The wiring diagram shows this switch wired inline with the sail switch. I am only guessing here but it would appear that the furnace is firing up and then shutting down after a bit. The board "in theory" senses the closure of the sail switch but the circuit apparently opens up after a bit. The board must think the switch has opened up to give that error.

Anyway, since the high limit switch is wired in series with the sail switch, I would replace the switch and make sure it operates very smoothly and there is no obstruction to the airflow.

I downloaded the training manual for the Atwood furnaces but it is too large to send over this forum. You can find the manual at the following link if you want to take a look.

https://myrvworks.com/wp-content/upl...ing-Manual.pdf
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Old 12-06-2023, 07:51 AM   #5
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Thank you .The furnace is a atwood brand and when I try to start it nothing at all happens ,just after a few seconds I hear a click which I guess is a safety kicking in
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Old 12-06-2023, 12:18 PM   #6
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Since nothing at all is happening at start up, that narrows down the troubleshooting. When the furnace receives the signal from the thermostat the first thing in the sequence is the blower should turn on. If that doesn't happen nothing else will.

Problem could be a stuck blower or an electrical problem. I would look into why the blower isn't starting. If the wheel turns freely then try measuring voltage inside the furnace ideally at the feed to the motor. Don't know how hard this might be.

I have attached a guide that may give some insight to the problem.
Attached Files
File Type: pdf RV Electrical Troubleshooting (ver 2).pdf (2.01 MB, 1 views)
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