Is your furnace or air conditioner trying to turn on but not working? Is it blowing cool air, or is it blowing hot air? If that’s the case, you should check your HVAC’s low-pressure switch before thinking it’s time for a furnace replacement.
Even if you think it’s too difficult to troubleshoot on your own, you’d be amazed to learn that you can quickly test your HVAC low-pressure switch by following a few simple steps.
Let’s delve deeper into the details!
What Is The Best Way To Test The HVAC Low-Pressure Switch? (Step-by-Step Instructions)
A low-pressure HVAC switch is convenient and serves multiple purposes in a home. They’re easy to find on things like air compressors, water heaters, and centralized ventilation systems, particularly fans.
Low-pressure switches must frequently be checked to discover whether they have malfunctioned or are not functioning properly.
Testing switches for functionality will help you isolate or resolve the cause of the problem. You can also troubleshoot the high-pressure switch with low-pressure switch troubleshooting.
So, How Exactly Do You Test Hvac Low-Pressure Switches?
1st step
First and foremost, switch off the power to the unit by disconnecting it or turning off the breaker that supplies it.
2nd Step
Remove the low-pressure switch cover after that. You may easily remove it by unscrewing its central screw with a suitable screwdriver.
3rd step
Separate the wires that connect the low-pressure switches to the terminal blocks and disconnect them immediately. Do you have any idea how you’ll distinguish these wires apart? These two wires are distinguished by their colors: blue or brown. Make sure you don’t disconnect the white and black cables, as they are the energy and power wires.
4th step
Apply air to an HVAC low-pressure switch with the air compressor.
5th step
After that, take an ohmmeter lead and place it on one of the two exposed wires. Apply the other lead to the second exposed wire while applying atmospheric pressure to an HVAC low-pressure switch.
If the low-pressure switch closes when atmospheric pressure is applied, an ohmmeter will read ‘0.’ This indicates that the HVAC low-pressure switch is functioning properly.
6th step
When applying atmospheric pressure to an HVAC low-pressure switch, turn the setpoint screw counter-clockwise.
If the pressure switch still won’t close, it’s likely that it’s broken or damaged and needs to be replaced right away.
Understanding the basics such as how often your furnace should cycle or how to test the pressure switch will help you avoid costly maintenance down the road. For any kind of part replacements, you can contact Martens Heating & Cooling at 920-685-0111 for a furnace repairman.