001 refers to the heaters core sensor misreading. Firstly to check distance around the heater and not covered or obstructed. If so any obstructions should be cleared.
If clearances OK and product is in guarantee and installed as per manufactures instructions a service visit will be required to resolve.
XLE050 XLE070 XLE100 XLE125 XLE150
NLSH050 NLSH070 NLSH100 NLSH100 NLSH125 NLSH150
DESE050 DESE070 DESE100 DESE125 DESE150
SSHE050 SSHE070 SSHE100 SSHE125 SSHE150
VASH050E VASH070E VASH100E VASH125E VASH150E AC6550 AC6554
Require additional help? Please follow link below
https://glendimplexservice.freshdesk.com/a/solutions/articles/79000136321
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