Cycle the Water Pump. Open a faucet close to the pump. Allow it to cycle completely. When the pressure drops, the switch may fail to close. This would indicate that the internal spring is bad. The switch needs to be replaced. Don’t touch the water while it’s energized. If you see sparks, remove power.
Inspect the pressureswitch Access the control board and inspect if the switch is stuck due to any blockage, a wire disconnection or any kind of mechanical jam. You may also need a multimeter to test the resistance of the switch. Unclog any blockage you discover, reattached any disconnected cable or replace the faulty switch.
This is when the high limit switch signals the blower motor to turn off. See Also: Thermostats The High Limit Switch’s Second Job. The high limit switch is also an extremely important safety device inside your furnace. When the furnace begins running, the switch’s role is to turn on the blower fan when the supply air gets hot enough.
(6) someone has sucked on the pressure switch with their mouth or forgot to unhook the pressure switch from the furnace before using a vac on the furnace. Sucking on the pressure switch or leaving a pressure switch attached to the furnace when vacuuming out the condensate line will ruin the diaphragm on the pressure switch.
Goodman GMSS96 Furnace Troubleshooting. • Furnace falls to operate. • No 115 volt power to furnace, or no 24 volt power to integrated control module. •Manual disconnect switch OFF, door switch open, or 24 volt wires Improperly connected or loose. •Integrated control module diagnostic LED provides no signal.