Rheem R96VA0702317MSA Error Code 44: Low Pressure Switch Closed, Inducer Off
What Does Code 44 Mean?
A code 44 on the Rheem R96VA0702317MSA is a critical fault indicating the low pressure switch is in the closed position before the heating cycle begins, when the inducer motor is not running. The pressure switch should only be closed when the inducer creates sufficient negative pressure in the venting system. Finding the switch already closed with the inducer off signals a serious malfunction — the pressure switch may be stuck or has been deliberately bypassed, either of which compromises the furnace's ability to verify safe venting conditions before ignition.
The IFC checks the pressure switch position at the start of every heat cycle as a safety verification step. If the switch is already closed before the inducer starts, the furnace knows the switch cannot be trusted to accurately reflect venting conditions, and it refuses to proceed with ignition. Cooling and fan-only modes remain operational since this check is only performed in gas heating modes.
A pressure switch that is welded or stuck closed is the most common cause. Deliberate bypassing of the pressure switch — an unauthorized and dangerous modification that removes a key safety layer — is another documented cause. Less commonly, an abnormally high negative pressure already present in the venting system from an unusual installation configuration can close the switch without the inducer running. A technician must determine the cause and replace or restore the pressure switch.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- Call a technician to test the low pressure switch and determine whether it is stuck closed or has been bypassed — both conditions require immediate repair before the furnace can safely heat your home
- The technician should check for any unauthorized pressure switch bypasses and replace the switch with the correct part; also inspect the vent system for unusual conditions that could create negative pressure without inducer operation
✓ Verified against manufacturer service manual — March 2026