Intermittent furnace heat in Mount Baker
After about ten days of heat coming and going, this Mount Baker homeowner needed a clear explanation for a furnace that would not always answer the thermostat. They had already contacted thermostat support. With the problem still interrupting the heat, the next step was to look beyond the thermostat and find out what was happening inside the furnace.
Following the startup problem
The thermostat’s alert was a useful clue, but the next step was to test the furnace itself. During testing, our technician found a fault in the pressure switch. This component helps the furnace determine when it is safe to continue its startup sequence, and it was sending an incorrect signal during startup.
A thermostat alert can make a heating problem especially confusing: the request for warmth is there, but the equipment does not follow through. Here, testing moved the diagnosis from the suspected thermostat connection to a component inside the furnace. Because the problem came and went, one successful start would not have answered the homeowner’s concern.
Replacing the switch and checking the heat
We replaced the pressure switch and adjusted it for the furnace. Afterward, the technician started and stopped the system to check its response. The completion notes record that the furnace was heating and operating normally at the end of the visit.
The goal was dependable heat without continuing to chase the thermostat connection. The job photos show the alert that accompanied the problem and the furnace firing during testing. The documented result is normal heating at the end of the visit, supported by the operating checks after the switch replacement.
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