Keyword Analysis & Research: heater pressure switch stuck open

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What does a pressure switch do on a furnace?

A furnace pressure switch is an automatic safety feature located near the motor. It shuts the furnace down if it senses negative pressure created by the draft inducer motor.

What is a high pressure switch?

The high pressure switch monitors the refrigerant pressure on the discharge side. When the discharge pressure moves in excess of 200-210 psi. (1379-1448 kPa), the high pressure switch closes the circuit and will cause the condenser fan to activate. When the pressure drops between, 164-174 psi.

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