Rheem · Furnace

44 Low pressure switch closed (stuck)

High severity Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC)RGPE/RGLE

What the control is telling you

Low-fire pressure switch (LPC) is closed when it should be open, before the inducer starts. The furnace will not start a heat cycle. RGPE/RGLE: thermostat shows Call For Service.

Applies to: 802P/80MDP (802PA050-150); RGPE/RGLE 2-stage 80+

Likely causes

Pressure switch contacts welded
Shorted or miswired switch wiring
Water in switch or hose

Test and repair steps

With the inducer off, check LPC contacts - must be open.
Check switch wiring for a short.
Check switch and hoses for water or moisture.
Replace the switch if contacts stay closed.

Settings for these units

Filter sizes as shipped, upflow (Table 19) · RGPE/RGLE
Reduced clearance to combustibles, upflow/horizontal (Fig. 4) · Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC)
Reduced clearance to combustibles (Fig. 3 and 4) · RGPE/RGLE

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Source: 802P: 92-24161-146-02, Diagnostics and Fault Codes table, p.40, 51; RGPE/RGLE: Table 16 p.49 / Table 20. Summarized in our own words; check the original manual for your model.

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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.