Electric space heater contactor won't stay latched
2-yr. old Fahrenheat FUH724 240VAC electric space heater malfunctioned this season. Contactor won't stay latched and cycles and cycles on and off every few seconds. Any cures other than a new contactor? 240V goes through high limit switch, contactor coil and thermostat. Would temporarily bypassing the thermostat and limit switch identify any contactor coil problems?
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one side of transformer secondary to one side of contactor coil. the other side of transformer secondary thru t stat to other side of contactor coil. line voltage 220v to l1, l2 of contactor . other side of contactor to load (220v heater. ) Make sure heater has some sort of overload /overheat safety either breaking line voltage or control voltage 24v.
Why not get a 24 volt definite purpose contactor and connect it to power? Use a transformer to open and close the contactor and then you can use a low voltage 2 wire el cheapo wall thermostat to turn on the heater?
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.
I assume you mean its not Heating by not firing? If its 3 phase you may have lost 2/3's of your heat not just 1/3. Look at the safety's and find if 1 or more are open. Also there is a fuse able link on most elements and if you have had the heater try to run without a blower lately (or anytime in the past) the link may be out. These are usually installed where they "see" the heaters. If you have power to all the elements look for this or a bad element(s).
If your contactor is still not pulling in check for open safety's or bad timer.
Before you open the the unit check first the warranty period /if open the unit the warranty will be cancelled .
The heat sensor not working in automatic / the heat exceed the limit by the heating machine the insulation keep smelling .
The small contactor might stuck due to spark and then stick together , /need to replace contactor .