What causes a contactor to not engage?
Answer: If the contactor is not getting the 24 volts to the contactor coil then it could be a time delay relay (if the unit is equipped), thermostat problem, transformer problem, safety control, (low on refrigerate) wiring problem, or a condensate pump, secondary drain pan safety switch problem.
How long does a contactor last?
The average lifespan of a good contactor can be anywhere from 5-10 years assuming the unit is taken care of with annual maintenance each year.
When should a contactor be replaced?
Your contactor can fail electrically in one of three ways. The coil can become shorted, grounded, or open. Your technician will use a meter to determine the resistance crossing your contactor. If the readings are outside of a very narrow range; your contactor should be replaced.
How much does it cost to replace a contactor?
Air Conditioner Repair Cost Guide
| Common Problem | Average Cost to Fix |
|---|---|
| Capacitor or contactor replacement | $90 – $475 |
| Home air compressor replacement | $1,350 – $2,300* |
| Evaporator coil replacement cost | $650 – $1,200 |
| Condensing unit fan motor replacement cost | $100 – $700 |
How do you fix a stuck contactor on a compressor?
If you locate the contactor and it is stuck shut but not damaged, you might be able to unstick it by tapping on it. Using a small wire brush to clean it off might allow you to run the AC temporarily without the contactor sticking immediately. But again, that’s not a long-term solution, and it should be replaced.
Why am I not getting 24 volts to my contactor?
Answer: The 24 volts comes from a low voltage transformer. If the contactor is not getting the 24 volts to the contactor coil then it could be a time delay relay (if the unit is equipped), thermostat problem, transformer, safety control (low on refrigerate), or wiring problem.
Can a contactor cause a breaker to trip?
This is frequently due to a weak run capacitor on the compressor. Less frequently this can be caused by a contactor in poor condition or an old compressor where the bearings have worn to the point that the unit requires higher starting torque than normal.
How do you maintain a contactor?
Keeping the contactor clean, both inside and outside, is important for good operation. Keeping the contactor clean will help eliminate overheating, high voltage leakage and breakdowns. Clean by blowing the dust and dirt away with a low pressure dry air stream.
Can I replace a 30 amp contactor with a 40 amp?
The contact current rating is the maximum value. A 30 Amp one can be replaced with a 40 Amp one. It fits in the space if it’s not too big.
How can we prevent contactor failure?
1.Run-time maintenance (c) Look out for any abnormal sound, like chatter, humming or buzzing during operation and as noise is an indication of poor contact or under-voltage. (d) Ensure no discolouration at the contact points and the coil is not burned out. (e) Keep the contactor clean, both inside and outside.