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Rheem 801C Series - User Manual

Rheem 801C Series
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INSTALLATION INSTRUCTIONS
FOR UPFLOW/HORIZONTAL SINGLE STAGE GAS
FURNACES WITH CONSTANT-TORQUE AIR CIRCULATION
BLOWER
(-)801T UPFLOW/
HORIZONTAL SERIES
(-)801C UPFLOW/
HORIZONTAL SERIES
(-)(-)80MSX UPFLOW/
HORIZONTAL SERIES
(-)(-)80MSC UPFLOW/
HORIZONTAL SERIES
ST-A1220-01-X0
92-24161-144-11
SUPERSEDES 92-24161-144-10
ACCREDITED
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Table of Contents

Questions and Answers

  • W
    williamsbrendaAug 9, 2025
    What to do if my Rheem 801C has failed ignition?
    • V
      valiAug 9, 2025
      If your Rheem Furnace fails to ignite, you can try the following: check the PS contacts, inspect the wires for any shorts, verify the line voltage at the IDM, and check the wiring and connections between the IDM and IFC.
  • T
    tmccartyAug 15, 2025
    What to do if my Rheem Furnace has a blower fault and is unable to run?
    • A
      Andrew WilsonAug 15, 2025
      If your Rheem Furnace's blower is unable to run due to a blower fault, check the wires for any shorts, verify the line voltage at the IDM, and inspect the wires and connections between the IDM and IFC.
  • B
    Brandon BaileyAug 21, 2025
    What to do if my Rheem 801C Furnace has low flame sense?
    • D
      David SmithAug 21, 2025
      If your Rheem Furnace has low flame sense, clean the flame sense rod if necessary. Also, check the wire continuously between the flame sense rod and the appropriate pin of the connector on the IFC.
  • F
    flopezAug 27, 2025
    What to do if my Rheem Furnace has unexpected flame?
    • E
      Edward GravesAug 27, 2025
      If your Rheem Furnace exhibits an unexpected flame, check for a blocked vent, excessive vent length or elbows, or a blocked heat exchanger.
  • R
    Roberta MartinSep 2, 2025
    How to fix reversed line and neutral on my Rheem 801C?
    • S
      Sonya EvansSep 2, 2025
      To correct reversed line and neutral on your Rheem Furnace, ensure proper polarity between L1 and neutral.

Summary

SAFETY INFORMATION

General Safety Warnings

Critical warnings about installation, operation, and potential hazards like fire, shock, and CO.

COMBUSTION AND VENTILATION AIR

Combustion Air Requirements

Essential requirements for providing adequate air for proper combustion.

Confined and Unconfined Spaces

Details on combustion air needs based on furnace location (confined vs. unconfined).

GAS SUPPLY

Natural Gas and Propane Safety

Critical safety information regarding gas leaks, fuel types, and detection.

ELECTRICAL WIRING

HIGH ALTITUDE

Natural Gas at High Altitudes

Procedures for adjusting furnace operation for natural gas at high altitudes.

LP Gas at High Altitudes

Procedures for adjusting furnace operation for LP gas at high altitudes.

START-UP PROCEDURES

Sequence of Operations

Step-by-step guide for safely starting up the furnace and its components.

FAULT CODES

Diagnostics and Fault Codes

Explanation of the diagnostic display and interpretation of fault codes.

Lockout Conditions

Details on different lockout modes (soft, hard) and their causes.

FIELD SELECTIONS & ADJUSTMENTS

AIRFLOW

Temperature Rise Check

Method for verifying correct airflow by measuring temperature differences.

SAFETY FEATURES

MAINTENANCE

DIAGNOSTICS

WIRING DIAGRAM

Rheem 801C Series Specifications

General IconGeneral
Ignition TypeHot Surface Ignition
AFUE Rating80%
Filter TypeStandard 1-inch Filter
Fuel TypeNatural Gas
StagesSingle Stage
Vent TypeNatural Draft
Warranty10-Year Limited Warranty

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