Heat Pump Not Heating in Santa Clara, CA

Heat Pump Not Heating in Santa Clara

Santa Clara is climate zone 4, cooling-dominant, with mild winters. That is easy duty for a heat pump, so a unit that stops heating here has a fault to find rather than a climate it cannot handle. Most no-heat calls come down to a stuck reversing valve, a defrost control problem, low refrigerant, or a contactor that is not pulling in.

The housing splits the diagnosis. On the city's older ranch homes we mostly see ducted heat pumps, often on tired original ductwork, where the usual no-heat causes apply and sometimes the heat is being lost in leaky ducts before it reaches the rooms. In the newer townhome developments the equipment is frequently a packaged rooftop unit, where a no-heat call also means roof-access coordination and a different parts inventory than a split system.

Whatever the configuration, the fix is a part-level repair we diagnose before quoting. We put the cause and the price on a written estimate. The $75 diagnostic is credited toward the repair when it runs over $200.

Common causes

Reversing valve stuck in cooling. The reversing valve switches the system into heat. A stuck valve or dead solenoid leaves the unit running but blowing cool air. We read line temperatures across the valve and check for the solenoid on a changeover. A bad coil is cheap; a seized valve body is a replacement.

Packaged rooftop unit fault (townhomes). On townhome packaged units, a no-heat call means getting on the roof and reading the unit's board and sequencing. The fault is often a defrost board, a contactor, or a sensor specific to the packaged design. We stock parts for the common roof-package brands.

Defrost control fault. Cold mornings 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.

Leaking ductwork on older ranches. If the equipment heats but the rooms stay cold, the original ducts in the older ranches are a likely culprit, dumping warm air into the attic or crawl space. We test duct leakage on the estimate and seal or replace the worst runs so the delivered heat actually reaches the registers.

Contactor or capacitor failure. A pitted contactor or weak run capacitor keeps the outdoor or packaged unit from starting, so there is no heat at all. Both are quick meter checks and we carry them. This is among the most common and cheapest no-heat fixes.

How we diagnose it

Confirm heat mode and a valid heat call from the thermostat.
On townhomes, coordinate roof access and read the packaged unit's board and sequencing.
Read line temperatures across the reversing valve on split systems.
Inspect the coil for ice and test the defrost board and sensor.
Test duct leakage on older ranches when the equipment heats but rooms stay cold, 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 Santa Clara: common questions

Do you cover Santa Clara from San Ramon?

Yes, Santa Clara is part of our regular South Bay route. We dispatch the closest tech and aim for same-day on no-heat calls when the schedule allows, best effort rather than a guarantee. On rooftop packaged units we confirm access before we roll so the visit is productive.

My townhome has a rooftop unit and no heat. Is that harder to fix?

It takes roof-access coordination and a slightly different parts inventory than a split system, but the failure modes are similar. We carry parts for the common roof-package brands and can usually run a same-day diagnostic once access is arranged.

The unit runs but the rooms stay cold. Heat pump or ducts?

In the older ranches it is often the ducts. The original ductwork leaks warm air into the attic before it reaches the registers. We verify the equipment is making heat first, then test duct leakage, so you are not paying to fix a heat pump that is working fine.

Nearby and related

Heat Pump Not Heating near Santa Clara: San Jose · Cupertino · Sunnyvale .

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