Rheem · Furnace

57 Pressure switch stuck open

High severity Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC)R95PRGPE/RGLE

What the control is telling you

802P and RGPE/RGLE: the high-fire pressure switch (HPC) did not close (or opened) when the inducer ran high speed for high fire. R95P (single pressure switch): pressure switch did not close; after 60 seconds of inducer run the control goes into a 5-minute soft lockout and retries. Not stored back-to-back in the RGPE fault buffer.

Applies to: 802P/80MDP (802PA050-150); R95P (R95PA040-115); RGPE/RGLE 2-stage 80+

Likely causes

Weak inducer or not reaching high speed
Hose cracked, disconnected, kinked or water-filled
Blocked vent/intake, excess vent length or elbows
Blocked heat exchanger or condensate backing up (R95P)
Wind / downdraft
Faulty switch or wiring

Test and repair steps

Check pressure switch hoses for cracks, kinks, water or moisture.
Check vent and intake for blockage; verify vent length and elbows are within manual limits.
Confirm the inducer is wired correctly and runs at normal speed.
802P check 24VAC is on W2 for high heat.
R95P check heat exchanger and condensate trap/drain for blockage.
Check switch and its wiring; replace if it will not close with proper draft.

Settings for these units

Clearance to combustibles (all models) · R95P

Location	Minimum clearance
Left side	0 in.
Right side	0 in.
Back	0 in.
Top	1 in.
Front	2 in.
Vent	0 in.
Service (front)	24 in. recommended

Same values for R95PA040 through 115.

Column order read from a rotated drawing header - confirm on the furnace clearance label.

Filter sizes as shipped, upflow (Table 19) · RGPE/RGLE

Cabinet width	Input	Bottom filter	Side filter	Quantity
17-1/2 in.	50, 75 (000 Btu/h)	15-3/4 x 25 in.	15-3/4 x 25 in.	1
21 in.	75, 100 (000 Btu/h)	19-1/4 x 25 in.	15-3/4 x 25 in.	1
24-1/2 in.	125 (000 Btu/h)	22-3/4 x 25 in.	15-3/4 x 25 in.	1

Use one filter location only - do not double-filter or filter the supply side.

21 in./100K: cut 3-1/2 in. off filter and frame for a side filter; 24-1/2 in./125K: cut 7 in.

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

Models that show this code

21 models in Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC), R95P, RGPE/RGLE

R802PA050314MSAR802PA075417MSAR802PA100521MSAR802PA125524MSAR802PA150524MSAR95PA0401317MSAR95PA0601317MSAR95PA0701317MSAR95PA0851521MSAR95PA1001521MSAR95PA1151524MSARGLE-05(-)BMKRRGLE-07(-)AMKRRGLE-07(-)BRQRRGLE-10(-)BRMRRGLE-12(-)ARMRRGPE-05(-)BMKRRGPE-07(-)AMKRRGPE-07(-)BRQRRGPE-10(-)BRMRRGPE-12(-)ARMR

Other codes on the same units

44 Low pressure switch closed (stuck)
45 Low pressure switch open - inducer high speed
46 Low pressure switch open - inducer low speed
55 Pressure switch stuck closed
58 Water sense circuit open
59 Water sensed / blocked drain
60 Blower fault - running (BLWR FLT-RUN)
61 Blower fault - blower not running

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Source: 802P: 92-24161-146-02, Diagnostics and Fault Codes table, p.40, 51; R95P: Diagnostics and Fault Codes table, p.87 (PDF p.91); RGPE/RGLE: Table 16 p.49 / Table 20; Fig. 45 p.63. 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.