Question

If the inducer fan runs but the pressure switch does not make, what are the 3 possible causes for this? (Hint: HH, FS, BFV)

A. High humidity, faulty sensor, blocked flue vent
B. Heat exchanger issues, flame sensor failure, broken fan vent
C. High head pressure, faulty switch, blocked furnace vent
D. High limit switch tripped, flame sensor malfunction, blocked flue vent

Answer 1

The three possible causes for the inducer fan running but the pressure switch not making are high humidity, a faulty sensor, and blocked flue vent.

Step-by-step explanation:

The three possible causes for the inducer fan running but the pressure switch not making are:

1. High humidity
2. Faulty sensor
3. Blocked flue vent

These factors can prevent the pressure switch from making a connection and activating the furnace. For example, if there is high humidity in the area, it can affect the operation of the pressure switch. A faulty sensor can also fail to detect the proper pressure and prevent the switch from being made.