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
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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