Amana GUCA115AX50 User Manual

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Service

Instructions

40" 90% Condensing Gas Furnaces

GUCA, GCCA & Accessories

This manual is to be used by qualified HVAC

technicians only. Amana does not assume

any responsibility for property damage or

personal injury for improper service proce-

dures done by an unqualified person.

RS6610002

Revision 0

October 1998

A

higher standard of comfor

t

Heating

n

Air Conditioning

®

Model and Manufacturing

numbers listed on page 4.

Questions and Answers:

M
millercharlesAug 8, 2025
What to do if the limit circuit opens repeatedly in my Amana GUCA115AX50 Furnace?
- J
  jesus09Aug 8, 2025
  If the limit circuit in your Amana Furnace (either primary or auxiliary) opens five times during a single call for heat, it indicates a problem with overheating. This could be due to insufficient conditioned air flowing over the heat exchanger. Check your filters and ductwork for any blockages and clean the filters or remove any obstructions. Also, check for loose or misconnected wiring and correct it.
D
davidwalkerAug 15, 2025
What to do if the pressure switch circuit opens repeatedly in my Amana Furnace?
- K
  Kyle WashingtonAug 16, 2025
  If the pressure switch circuit in your Amana Furnace opens five times during a single call for heat, several issues could be the cause. First, check the pressure switch hose for any blockages, pinches, or misconnections and correct as needed. Also, check the flue and/or inlet air piping for blockages, proper length, elbows, and termination. Inspect the drain system and verify the proper pressure switch set point and contact motion. Finally, check for loose or misconnected wiring and correct it.
B
Brian MitchellAug 23, 2025
How to fix a low flame sense signal on an Amana GUCA115AX50?
- G
  gibsonedwardAug 23, 2025
  A low flame sense micro-amp signal in your Amana Furnace can be caused by a few things. The flame sensor might be coated or oxidized; if so, sand the flame sensor. Also, inspect the sensor for proper alignment. It could also be caused by a lazy burner flame due to improper gas pressure, so check for proper gas pressures. The flame sensor might also be incorrectly positioned in the burner flame. Check the inlet air piping for blockage, proper length, elbows, and termination.
J
jenniferwilsonAug 31, 2025
What causes an Amana GUCA115AX50 to sense flame with no call for heat?
- R
  rtaylorAug 31, 2025
  If your Amana Furnace senses a flame even when there's no call for heat, it's likely due to a short to ground in the flame sense circuit. Correct the short at the flame sensor or in the flame sensor wiring.

Amana GUCA115AX50 Specifications

General

Brand	Amana
Model	GUCA115AX50
Category	Furnace
Heating Capacity	115, 000 BTU
Stages	Single Stage
Weight	Not found in specifications
Thermostat Compatibility	Standard
Fuel Type	Natural Gas or Propane (with conversion kit)

Summary

IMPORTANT INFORMATION

Safety Warnings and Notices

Crucial safety alerts, warnings, and cautions for operation and service.

PRODUCT IDENTIFICATION & SPECIFICATIONS

Model Identification and Accessories

Details on model numbers, accessory kits, and optional components.

Model Number Breakdown

Explanation of the model number structure for furnace identification.

Operating Instructions

Step-by-step guide for safely starting and operating the furnace.

Furnace Dimensions and Clearances

Physical dimensions and minimum clearances for installation.

Furnace and Blower Performance Specifications

Technical data for furnace heating output and blower airflow.

Combustion Air and Ventilation Requirements

Guidelines for air supply, ventilation, and flue pipe installation.

INSTALLATION & DESIGN CONSIDERATIONS

Condensate Drain Lines and Trap Installation

Procedures for installing the condensate drainage system.

Product Design, Safety, and Application

Furnace design, safety warnings, and intended use.

Installation Location and Connections

Guidelines for furnace placement, gas, and electrical connections.

Ductwork and Filter Requirements

Specifications for air filters and ductwork design.

SYSTEM OPERATION & TROUBLESHOOTING

Normal Operating Sequences and Timing

How the furnace operates in heating, cooling, and fan modes.

Troubleshooting Common Issues and Lockout Resets

Diagnosing and resolving operational problems and lockout conditions.

Polarization, Phasing, and Maintenance

Checking electrical connections and routine furnace upkeep.

Servicing Procedures and Component Checks

Detailed diagnostics, performance tests, and part checks.

WIRING DIAGRAMS & SCHEMATICS

Furnace Wiring Diagrams

Electrical connection diagrams for GUCA and GCCA models.

System Operation Schematics

Schematics illustrating furnace control and operation.

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