Recalls and Service Alerts

Furnaces - Air Conditioners - Heat Pumps

iHarmony® and SLP98 – Insufficient Zone Heating and Alarm Code 250 Issues

Type: Service Alert
Equipment: Thermostat
Recall or Alert Date: 03-25-2015
Serial Number: ACC-14-01
Brands Affected: Lennox

Description of Problem:

Insufficient Heating: The discharge air temperature sensor (DATS) will cause premature shut off of heating before reaching the desire zone temperature setpoint. When zoning is disable heating works correctly.

An erroneous furnace limit trip (alarm 250) is active causing a lockout. The furnace will terminate heating operation, open all dampers (central mode) and turn the blower on to cool down the furnace. Condition may also overheat some zones.

Affected Products:

iHarmony® and SLP98