Lennox XC25 – System Overview

Refer to the iComfort Wi-Fi® Thermostat Installer Setup Guide for configuration procedures.

The outdoor control provides the following functions:
– Internal switching of outputs.
– Compressor anti-short-cycle delay (adjustable through the thermostat interface.
– Five-strike lockout function.
– High (S4) and low (S87) pressure switches.
– Ambient (RT13) and liquid line (RT36) temperatures monitoring and protection.


The five-strike lockout function is designed to protect the compressor from damage. The five-strike feature is used for both high (S4) and low (S87) pressure switches.

Resetting Five-Strike Lockout

Once the condition has been rectified, power to the outdoor control R terminal must be cycled OFF.


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