Heat Pump Not Heating in San Ramon, CA

Heat Pump Not Heating in San Ramon

San Ramon sits in the Tri-Valley with the bigger workload on cooling. Summers regularly climb past 95, but winters still drop near freezing overnight, and that is comfortably inside any heat pump's range. So when one stops heating here, it is a failed part, not the climate. The reversing valve, the defrost control, the refrigerant charge, or the outdoor contactor are where these calls land.

Our installed base in San Ramon skews two ways. A lot of the older tract homes run heat pumps that were switched over from old gas furnaces, and many of those carry electric backup heat that fails quietly. The newer subdivisions run multi-zone equipment with control boards, where a no-heat fault in one zone is usually a board, a zone damper, or a sensor rather than a dead compressor.

Because the shop is here in town, San Ramon calls tend to be the quickest ones we reach. We diagnose the real fault and put it on a written estimate before any repair. The $75 diagnostic is credited toward the repair when it runs over $200.

Common causes

Reversing valve stuck. The reversing valve switches the unit into heating. When it hangs or the solenoid fails, the heat pump runs but blows cool air. We read line temperatures across the valve and listen for the solenoid on a mode change. A bad coil is cheap; a seized valve is a replacement.

Aux heat strips not engaging (furnace conversions). Many of our furnace-to-heat-pump conversions carry electric backup for the cold mornings. If a strip opens or the board never calls aux, the house stays cold while the compressor runs. We test each strip element and confirm the board energizes backup on a real demand.

Zone or control board fault (multi-zone homes). On the newer multi-zone systems, one cold zone with the rest fine usually means a stuck zone damper, a failed zone board, or a bad sensor, not a dead heat pump. We test the zone controls and dampers and isolate the faulted circuit rather than condemning the whole system.

Defrost control fault. Tri-Valley mornings near freezing will ice the outdoor coil, and the defrost cycle has to clear it. A failed defrost board or sensor leaves the coil iced and unable to absorb heat. We check defrost timing and sensor resistance and confirm the unit reverses to defrost.

Contactor or capacitor failure. A pitted contactor or weak capacitor stops the outdoor unit from starting, so there is no heat at all. Both are fast meter checks and we carry them on the truck. This is one of the most common and least expensive no-heat causes we see in San Ramon.

How we diagnose it

Confirm heat mode and a valid heat call at the thermostat or zone panel.
On multi-zone systems, identify whether the fault is one zone or the whole house.
Read line temperatures across the reversing valve and listen for the solenoid.
Inspect the outdoor coil for ice and test the defrost board and sensor.
Test aux heat strips and meter the contactor and capacitor.

$75 diagnostic, credited toward any repair over $200. You get a written quote before any work begins.

Heat Pump Not Heating in San Ramon: common questions

How fast can you get to a San Ramon no-heat call?

San Ramon is where our shop is, at 365 Reflections Circle, so it is usually one of the quickest calls we reach. We respond fastest here because we are already in town. On no-heat calls we prioritize same-day, which is best effort rather than a hard guarantee.

Will a heat pump keep up on a cold San Ramon morning?

Yes. Our winter overnight lows are well inside any modern heat pump's heating range. If yours stopped heating, that is a failed part to find, not the cold overwhelming the equipment. Backup heat strips, where fitted, only kick in on the coldest mornings and are a common quiet failure point.

Only one room or zone is cold. Is the whole heat pump bad?

Almost never. On a multi-zone system, one cold zone usually points to a stuck damper, a zone board, or a sensor. We isolate the faulted zone rather than condemning the system, which keeps the repair targeted and the cost down.

Nearby and related

Heat Pump Not Heating near San Ramon: Danville · Alamo · Dublin · Pleasanton .

This is usually a heat pump installation & service in San Ramon job. See our heat pump installation & service overview or the San Ramon service area.