I have a 1f97- 1277. It is being used on a two zone hot water system to control the secondary zone away from the zone via sensor. The main controls work fine. This thermostat works but overnight it seems not to function properly. The only way I can get it on is by opening the main zone

Asked by Isaac on 01/11/2015 1  Answer

ManualsOnline posted an answer 9 years, 3 months ago

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