If your air compressor starts up fine on the first start of the day, but stalls and makes a loud humming sound on subsequent tries, you’ve got a bum “Unloader” valve. The air compressor unloader valve is what makes the “Psssssst” sound when the motor shuts off after reaching operating pressure. The air compressor unloader valve is usually built into the pressure switch assembly.
Air compressors can explode if you don’t practice proper air compressor repair and maintenance. Below are some insights into how to repair and fix an air compressor. Check out this great resource for affordable quality compressor parts to fix your air compressor.
Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site. Whether they are new or have been in use for years every air compressor will one day have air compressor problems, and fixes to resolve those problems. There are many pages linked below, each addressing many of the issues compressor owners may encounter with their compressor.
how to repair air compressor Related Question:
Can you repair an air compressor?
Air compressor repair can be simple. The air compressor unloader valve is what makes the “psssssst” sound when the motor shuts off after reaching operating pressure. It’s actually venting the residual pressure from the compressor head so the motor doesn’t have to work as hard on the next startup.
What causes an air compressor not to work?
An air compressor problem could stem from one of many issues, such as an air leak, an oil leak or a broken part. In some cases, you might have insufficient pressurization or air flow. In other cases, the compressor might fail to start up or stop running as prompted.
Is it worth fixing an air compressor?
On the other hand, replacing your compressor may be the most viable solution in circumstances like: If it has broken down once, then it is more likely it will happen again. Compressors are becoming more energy efficient all the time, so the cost of a new unit could soon pay for itself in electricity savings.
How do you fix an air compressor that won’t start?
If the compressor won’t start with air in tank, replace the check valve. If the compressor won’t start with an empty air tank, replace the pressure switch if it isn’t activating the pump motor. Replace the pump motor if it doesn’t start when activated by the pressure switch.
Why would a compressor have low pressure?
The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Refrigerant under-charge, due to a refrigerant leak or improper charge. TXV (TEV) malfunction, over-metering refrigerant.
What happens if air compressor runs out of oil?
Running a compressor out of oil can seize the engine (much like your car) or a bad bearing in an electric motor can seize it and cause a no-start issue.
Where is the unloader valve on an air compressor?
Where Is the Unloader Valve Located? If you own a smaller reciprocating air compressor, you’ll likely find the unloader valve mounted on or inside the pressure switch. When the switch shuts the compressor off, it actuates the valve.
What happens if the compressor fails?
When your ac compressor fails, less air will come out from the vents, the air coming out could be warm, and the system may continually run without actually cooling your home. This is because refrigerant isn’t pumped through the system, and it can result in a higher power bill.
How much does it cost to replace an air compressor?
According to data by HomeGuide, the average cost to replace a home air conditioner compressor is about $600 to $1,200 under warranty, or $1,300 to $2,500 when it’s not under warranty. Many HVAC contractors charge $100 to $150 per hour plus the cost of parts to repair a home AC compressor.
How often should I replace my air compressor?
Consider repairing your air compressor if: It has completed less than 50,000 hours of service or has been operating for less than 10 years. Its technical problems are relatively harmless and not indicative of enduring, unavoidable problems.
How long does it take to fix an air compressor?
It entails removing and disposing of any remaining refrigerant, disconnecting and removing the old compressor, installing the new one with proper fittings, and recharging with refrigerant. Add it all up and it typically takes four to six hours.
When should a compressor be replaced?
On average, the lifespan of a compressor ranges from 10 to 15 years. Therefore, if your HVAC compressor is 10 or more years old, and presents any signs of failure that are indicative of bigger problems to come (e.g. unusual noises, short cycling, reduced cooling capacity, etc.), then it might be better to replace it.
Is there a fuse for the air compressor?
Blown Fuse or Tripped Breaker Some air compressors have reset switches while others will have in-line fuses that need to be checked. To find them follow the line of power from the air compressor back to the outlet. If you find a blown fuse or tripped breaker go ahead and either replace the fuse or reset the breaker.
How do you reset an air compressor?
To reset your reciprocating air compressor, allow time for the compressor to cool down and then push the reset button before attempting to turn the unit on again.
