Heat Pump Not Heating in Fremont, CA

Heat Pump Not Heating in Fremont

A heat pump that stops heating in Fremont is usually one failed part away from working again, not a system at the end of its life. Fremont winters are mild even in the warmer eastern neighborhoods, so the equipment is operating well within its range. When it blows cold, the cause is mechanical or electrical, and it is findable.

Fremont is large enough that the problem looks different across the city. In the bay-moderated western zones, many homes lean on the system mostly for heat, so a no-heat call is the first time anyone has stressed the equipment in a while, and aged contactors, capacitors, or a stuck reversing valve tend to surface. In the warmer eastern neighborhoods, the newer multi-zone and variable-speed systems fail differently: control-board logic, a zone fault, or a low charge that a variable-speed compressor masks until it cannot keep up.

We bring the gauges and meters charge work and modern variable-speed equipment need to both ends of the city. We read the actual fault and write it down with the repair cost before any work starts.

Common causes

Reversing valve stuck in cooling mode. If the reversing valve or its solenoid coil fails, the heat pump keeps cooling when it should heat, and you get cold air in winter. We test the coil and confirm the valve shifts on a mode change. A coil is a part swap; a mechanically stuck valve is a refrigerant-side repair, and we tell you which you have first.

Low refrigerant charge on a variable-speed unit. Newer systems run variable-speed compressors that ramp up to mask a low charge, until they cannot, and then heating falls off. We gauge the system and read subcooling and superheat against spec, then trace the leak. These units are unforgiving of a sloppy recharge, so we repair the leak rather than top off.

Contactor or capacitor failure. On the western bay-side homes that mostly run for heat, the outdoor unit may have sat lightly used, and a pitted contactor or weak capacitor keeps the compressor from starting. The blower then moves unheated air. We measure the capacitor and inspect the contactor, both carried on the truck.

Defrost control fault. The defrost board clears frost off the outdoor coil during heating. A failed board or sensor lets the coil ice over until it can no longer absorb heat from outside air. We run a defrost cycle, test the sensor, and replace the board if the timing is wrong.

Zone or control-board fault. On the newer multi-zone Fremont systems, a bad zone board, stuck damper, or control fault can leave a zone calling for heat that the equipment never receives. We meter the heat call at the board and cycle the dampers to separate a control problem from an equipment problem.

Aux heat not engaging. Heat pumps with electric backup rely on the strips during defrost and the coldest mornings. A failed sequencer or relay leaves you with cold air at the worst time. We confirm the strips draw current on a call and that the control stages them correctly.

How we diagnose it

Confirm the reversing valve shifts into heating on a thermostat call and the compressor starts.
Read refrigerant charge with gauges, paying attention to variable-speed behavior, and locate any leak.
Measure capacitors and inspect the contactor on systems that mostly see heating duty.
Run a defrost cycle and test the board and coil sensor.
On multi-zone systems, meter the heat call at the zone board and cycle each damper.

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

Heat Pump Not Heating in Fremont: common questions

You are based in San Ramon. Do you actually cover Fremont?

Yes, Fremont is a regular service area for us, from Centerville out to Warm Springs. We are over the hill from our San Ramon base, so response is reliable; same-day is best effort and not guaranteed. Call (925) 999-4095.

If I end up needing a new heat pump in Fremont, are there rebates I can use?

Sometimes, depending on your utility and the program in effect at the time. Rebate programs and amounts change every cycle, and some open and close without much notice, so we confirm what is actually paying when we write the estimate rather than promising a number up front.

My heat pump runs constantly but the house never warms up. What does that mean?

Long runtime with weak heat usually points to low refrigerant charge, a stuck reversing valve, or an iced outdoor coil from a defrost fault. On a variable-speed system it can hide for a while before heating drops off. A diagnostic finds it; the $75 fee is credited toward any repair over $200.

Nearby and related

Heat Pump Not Heating near Fremont: Newark · Union City · Hayward · Milpitas .

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