Service Bulletin 22-0016-MH-1MBTU

To: Notified customers
Date of Notice: 10/7/22
Subject: IQ Screen Communication Loss

Product Line: Maxi-Heat 1MBTU
Model: Heater
Serial Numbers: 36-000818 through 36-000918
Expiration Date: No expiration

Description or Summary of Problem to Be Corrected:

1. Four wires have been routed to the incorrect relay terminals for the air recirculation switches. This causes the 1 amp fuse in the DHECU  controller to fail and "Screen not Connected" fault on the burner controller. When the fault appears it will not allow operation of the  burners.

Corrections and Instruction:

1. Remove relay wires and relocate each to the correct terminals. The orientation of the wires must match the correct photo and  instructions on page two. Check the 1 amp fuse in the DHECU box located in the main breaker panel and ensure it has not failed.

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