Rheem 42-105499-08K Low Fire Pressure Switch (-0.30" WC)

Specifications

• Part Number: 42-105499-08K
• Brand: Rheem PROTECH
• Product Type: Low Fire Pressure Switch
• Pressure Rating: -0.30" WC
• Application: Two-Stage Gas Furnaces (Low Fire)
• Function: Monitors inducer draft during the low-fire heating cycle.
• Genuine OEM Replacement Part
• Kit Includes: Pressure switch, mounting hardware, and installation instructions.

Some Compatible Rheem Furnace Models Include

• R96TA0602317MSA
• R96TA0702317MSA
• R96TA0852521MSA
• R96TA1002521MSA
• R96VA0602317MSA
• R96VA0702317MSA
• R96VA0852521MSB
• R96VA1002521MSA

Common Symptoms of a Failing Rheem 42-105499-08 Low Fire Pressure Switch

If your Rheem or Ruud two-stage gas furnace in Calgary, Edmonton, Red Deer, Lethbridge, Medicine Hat, or anywhere in Alberta, or throughout the Greater Toronto Area, including Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Burlington, Milton, Ajax, Pickering, and Oshawa, will not complete its heating cycle, a faulty 42-105499-08K Low Fire Pressure Switch may be preventing the furnace from proving proper inducer draft.

Common symptoms include:

• Inducer motor starts, but the burners never ignite.
• Furnace repeatedly attempts to start before locking out.
• Pressure switch fault or diagnostic error codes.
• Furnace operates intermittently, especially during low-fire operation.
• Ignition sequence stops before the hot surface ignitor or gas valve is energized.
• Heat works occasionally but fails on subsequent calls for heat.
• Clicking from the pressure switch without completing the ignition cycle.
• Furnace locks out until power is reset.
• Pressure switch fails continuity testing even when the proper draft is present.