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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Had same problem K-Star 10 both contactors, Check all your connections, I found 2 loose. If the contactor closes and can't get enough power the voltage drops, contactor starts to chatter. Loose connections also cause arcing and fires. The manual says do not store clorine in the same room.
I took the contactors out, to the bench, applied 208volts to the coil and beat on them till they stopped acting up. Put them back and they work. They are very ugly on the inside I will replace them as soon as I can find new ones on Monday..
If the contactor won't pull in the first thing to check is the low voltage circuit to the contactor. Is there 24v going to the contactor? If yes and the contactor is not pulling in, then you have a bad or dirty contactor. I have often time seen bugs get in between the contacts and stop the flow of electricity. If there is not 24v being supplied to the contactor then you will have to check your thermostat and the wiring from the furnace to the outdoor unit. Hope this helps
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?
Assuming that the machine fill cycle works properly and the float is intact, and the heater contactor doesnt pull in:
possible heater contactor malfunction: check for power to coil
High limit snap thermostat may be tripped or damaged ( needs to be manually reset). located in heater connection cover.
Thermistor probe and or wiring to it may be damaged
main control board may not be functioning properly. check output to heater curcuit
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.
1>Tom you must pay atention on electrical suply if coil of contactor, your contactor gets suply of electric wich passes through the contactor. 2>please go back to contactor and pay atention to coil suply you must have mistaken there something. 3> if it isnt visible than study the old contactor, was he 3 closed 1 open contact or 4 closed???? it can be that too, the contactor could not be with the same function.
Double check that the new contactor has the same electrical ratings on it. My guess is that the coil should be 24v while the relay should be able to carry the same amperage at 220v.
First shut off the breaker and disconnect switch for the furnace and outdoor condenser and call a licensed HVAC contractor:)
If you are determined to do it yourself, Then read the schematics first. Be aware, if you mis wire the system you may cause more damage than you have now. Not to mention your personal safety is at risk.
I am basing this on the most common style contactor found in my area.
The main relay side should be labeled. (eg. L1,L2-T1, T2). These should match exactly like the old one. L1 and L2 are the incoming power. T1 and T2 are the power leaving the contactor. All the 220v wires should correspond to one of these four terminals either by screwing them down or fitting the spade connectors together.
Usually the 24v wires will plug onto the coil (near the bottom, left and/or right sides of the contactor) silver spade connectors.
(STEP 1.) Leave all Wires Connected to your Old Contactor.
(STEP 2.) Remove the two mounting screws that hold the Old Contactor to the Air Conditioners casing.
(STEP 3.) Now Install the New Contactor to the old contactors existing location using the Same two Screws.
(STEP 4.) Now take Off one wire at a time from your old Contactor and
Install each wire one at a time to the proper location on the new
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 .