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Mend Honeywell Sundial Y Plan Heating Thermostat Clicking

how can i fix my honeywell sundial y plan?

my heating woudnt come on and the thermostat was clicking i manually moved the lever to open on the honeywell and the radiators slowley heated up why is this?

bex
December 2010
HoneywellHoneywell Sundial Y PlanHeating, Home Heating SystemsHeating Thermostat Clicking

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Honeywell Sundial Y Plan: Fixes & Troubleshooting