Replacing an intermittent thermostat in Wallingford
Heat that starts on one attempt and fails on another can be hard to pin down. At this Wallingford home, the first visit found that the furnace could operate normally, while the thermostat sometimes failed to start it or keep it running. The homeowner chose a thermostat replacement to address that inconsistent control.
Separating the furnace from its control
During the original diagnosis, our technician was able to turn the furnace on and off normally. The concern was the intermittent thermostat response, rather than a furnace fault found during those tests. The technician recommended replacing the thermostat so the system could receive a reliable call to run.
The homeowner approved the repair, and the replacement was arranged for a return visit. This gave the work a clear purpose: address the control that was interrupting heating instead of changing furnace components that had tested normally.
Installing the thermostat and checking the response
On the repair visit, we replaced the old mercury thermostat with a new wall control. The technician then tested furnace operation from the thermostat, checking both startup and shutdown to confirm the signaling was working.
The furnace started and stopped normally during those checks, with no further concerns found at the time. The photo shows the replacement thermostat documented on the visit. For the homeowner, the repair followed the intermittent problem back to its source, then checked the same everyday action that had been unreliable: asking for heat from the wall and seeing the furnace respond.
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