20 Most Recent Fahrenheat FUH5-4 Heater Questions & Answers

you may have 115v/120v instead of 208v/230v. check connection at wall switch or j-box.

Fan maybe running to slow and allowing the elements to get too hot and open circuiting the cut out. This will be a fault with the fan or maybe dust and debris in the intake vents.

If you can't turn it off then it requires a new on/off switch to be fitted.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

You could tripping the high temp limit this will be located near the heat exchanger When it shuts how long does the blower motor stay running? Do you have a meter?

check the thermostat to see that it is working proper, if it wont shut off, it is being told that it is not the temp. in the room that it is set for,

It sounds like you have 120v from line 1 and line to to ground. What do you have between line 1 and line 2?
You should have 220 or 240v. If you dont have this
the problem is at the breaker. Are the wires going to the same breaker?

If you do have 220 or 240 between line 1 and line 2 at the unit, then it appears thr problem is at the unit,
probably the thermostat isn`t turned up high enough?

If it has a contactor, is it pulled in? If not then there is
a control problem. If you are skilled and confident you
could simply push the contactor in and it should
operate or have an electrician do it. Most of the time
you can bypass the thermostat and close the
contactor that way.

These heater elements should never glow red. The fan should come on at the same time the heater elements get power to heat up. If they turn red, the fan isn't starting fast enough, or is just turning too slow. Think of it like a toaster. They glow red but if you blow on them, they cool down until they aren't red anymore but they are still hot. I have this same heater. In the fan end opposite the fan motor, there is a little brass bushing (bearing) on the fan shaft that's mounted inside a rubber mount. Pop the rubber mount out of the heater housing, clean it up with degreaser and put grease or a heavy duty oil on the shaft and reassemble. If it still turns slow after that, it needs a new fan motor. You can probably match it up with the same motor from McMaster Carr or Grainger for cheaper than from Marley. I hope this helps

What is this? please give exact details.

You may have to put a few drops of machine oil on the motor shaft. There is a felt washer on both ends of the motor shaft that absorbs and stores the lubricant. It probably is dry.

Here is the link for the owner's manual. Or call customer service at 1-800-654-3545. http://www.manualshelf.com/manual/fahrenheat/fzl4004/instructions-assembly.html

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