The electrical contacts in your pressure switch can degrade over time. If there is pressure above the cut in pressure then the switch staying open is normal.
Industrial Pressure Switches Pressure Controls Danfoss
Pressure switch contacts stay open. Closes at 4 psi. If the contacts remain open and there is no water pressure the switch is bad. Sometimes when the pressure reaches 50 lbs. If the contacts are held open and there is no water pressure attempt to cycle the switch by pulling the contacts open. You make a temporary repair to contacts by filing away the affected area though be sure to kill all power to the pump before you do. On circuits that are intrinsically safe.
Micro switches with gold contacts are normally used on low voltage low current applications ie. Heres some helpful hints to help save time on a service call. The pressure switch is square d class 9013 ser b fsg on 30 psi off 50 psi any suggestions on what i. The pressure switch contacts stay closed. 2801050103 hp 12 volt 230 hertz 60 max amp 59 automatic thermal motor protection. For higher voltagescurrents silver contacts are used.
I do not know what the pump is since i did not own the house when it was installed. It could be your pressure switch stuck open or closed. Honeywell hobbs hour meter pressure switch california power systems honeywell hobbs hour meter pressure switch normally open. Both the supply side and the motor side are reading 240 volts. Generally they are a normally open switch that closes with either a rise or fall in the pressure it is monitoring they are used mostly as a safety device but are also used for operation control such as fan cycle controls for low ambient cooling starting and stopping for steam boilers and the list goes on. Single circuit with two insulated terminals.
The contacts stay closed even when the pump is unplugged. I replaced the pressure control switchthe pressure gauge and the 4 pipe the control switch sits on. Here is the info on the control box. Zero or near zero water pressure into the switch plus open contacts means a faulty pressure switch. Having issues with your hvac unit overheating or shutting off. The contacts are closed and do not appear to be burnt.
I can physically open the contacts but when i let go they returned to the closed position. When the pressure switch actuates the no contact become close and the nc becomes open. Check that you have near zero water pressure. If the switch closes turn the power back on. The gauge should read near zero but what if the gauge is faulty. The points open as they should and sometimes they remain closed even though the pump tuns off.
This may dislodge the internal spring. I then checked the pressure switch. The contacts are not welded shut. Frequent cycling of power to the switch and the presence of corrosive substances are two common causes.
Gallery of Pressure Switch Contacts Stay Open
