Trane TCONT203AS42MA User Manual

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Pub No. 18-HD50D1-1A-EN

Part No. 37-7768003

December 2018

TCONT203AS42MA

Installation and User Guide

Trane XR203

Programmable Thermostat

ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

IMPORTANT — This Document is customer property and is to remain with this unit.

These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with

the installation. Should further information be desired or should particular problems arise which are not covered sufficiently

for the purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.

Table of Contents

Questions and Answers:

C
Christopher BartonAug 8, 2025
What to do if my Trane Thermostat has no heat, cool, or fan?
- B
  Brittany JohnsonAug 8, 2025
  If your Trane Thermostat isn't producing heat, cool air, or fan function, here's what you can check: * **Blown fuse or tripped circuit breaker:** Replace the fuse or reset the breaker. * **Furnace power switch:** Ensure the furnace power switch is turned ON. * **Furnace blower compartment door:** Make sure the door panel is properly installed to engage the safety interlock or door switch. * **Loose connections:** Tighten any loose connections to the thermostat or system.
C
Christine RogersAug 12, 2025
What to do if my Trane Thermostat is not cooling?
- A
  Anna WallaceAug 12, 2025
  If your Trane thermostat isn't cooling, first ensure the system is set to 'Cool'. Check that all thermostat and system wires are securely attached. If the issue persists, set the system to Cool and lower the set point below room temperature for diagnostic purposes. Note that there may be up to a five-minute delay before the thermostat clicks in Cooling if the compressor lock-out option is selected in the installer menu.
R
Ryan WilliamsAug 17, 2025
What to do if my Trane Thermostat is not heating?
- E
  Emily BryantAug 18, 2025
  If your Trane thermostat isn't heating, first ensure the system is set to 'Heat'. Check that thermostat and system wires are securely attached. If the issue persists, set the system to Heat and raise the set point above room temperature for diagnostic purposes. Within five minutes the thermostat should make a soft click sound and “Heat On” should appear on display. If the thermostat does not click, try the reset operation. If the thermostat does not click after being reset, contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating system is operating correctly.
K
kathryn06Aug 23, 2025
Why does the 'Call for Service' icon appear on my Trane TCONT203AS42MA?
- E
  Edgar DillonAug 23, 2025
  The “Call for Service” icon on your Trane thermostat may appear due to several reasons: 1. The heating system cannot raise the space temperature to within 10 degrees of the set point within 2 hours. Refer to troubleshooting for 'No Heat'. 2. The cooling system cannot lower the space temperature to within 10 degrees of the set point within 2 hours. Refer to troubleshooting for 'No Cool'. 3. If “--” is displayed for the Room Temperature, a replacement thermostat is needed. 4. None of the buttons operate on the thermostat. Ensure keypad lockout is not turned on, if it’s OFF, try reset. 5. If “Call for Service” is flashing, contact a service person to verify the outdoor equipment is operating correctly, as the compressor self-diagnostic is detecting an issue with the outdoor unit.
R
Ryan SandersAug 27, 2025
Why does my Trane Thermostat's heat, cool, or fan run constantly?
- F
  Frank OlsonAug 27, 2025
  If the heat, cool, or fan on your Trane Thermostat runs constantly, there might be a short in the wiring, thermostat, or the system itself. Check each wire connection to ensure they are not shorted or touching other wires. Try resetting the thermostat. If the condition persists, it's best to contact your HVAC service person.
J
Joy BuchananSep 1, 2025
Why is my Trane Furnace (Air Conditioner) Cycling Too Fast or Slow?
- W
  Willie CaldwellSep 1, 2025
  The cycling rate of your Trane furnace or air conditioner might be influenced by the thermostat's location or the heating system's size. Digital thermostats offer more precise control and cycle faster than older models, turning on and off more frequently but running for shorter durations. To increase the cycle time, select 'SLO' for slow cycle in the Installer menu. If an acceptable cycle rate isn't achieved, contact your HVAC service person.

Trane TCONT203AS42MA Specifications

General

Brand	Trane
Model	TCONT203AS42MA
Category	Thermostat
Language	English

Summary

Safety

Installation

Location

Mounting and Installation

Step-by-step instructions for mounting the thermostat control to the wall.

Wiring Diagrams

Illustrates wiring connections for various heat pump and cooling system configurations.

Installer Menu

Accesses advanced system settings for professional installation and configuration.

Test Modes

Fan Operation

Heating System

Auxiliary System

Cooling System

Thermostat Overview

User Menu

Customizes thermostat settings accessible to the user.

Thermostat Operation

Scheduling

Describes the energy-saving factory schedule and programming options.

Modify Heating Schedule

Modify Cooling Schedule

Thermostat Settings

Troubleshooting

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