If the jumper is on pins 2 & 3 or has accidentally been knocked off during transit/installation, this will activate the school lock.
To disengage school lock, put the jumper on pins 1 & 2. If the jumper is missing, and unable to be found, click the help link below for further assistance.
https://glendimplexservice.freshdesk.com/a/solutions/articles/79000136321
Applicable Models:
QM50RF, QM70RF, QM100RF, QM125RF, QM150RF
XLE050 XLE070 XLE100 XLE125 XLE150
TSRE050 TSRE070 TSRE100 TSRE125 TSRE150
NLSH050 NLSH070 NLSH100 NLSH100 NLSH125 NLSH150
DESE050 DESE070 DESE100 DESE125 DESE150
SSHE050 SSHE070 SSHE100 SSHE125 SSHE150
VASH050E VASH070E VASH100E VASH125E VASH150E AC6550 AC6554
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