Heat Pump Not Heating in Union City, CA

Heat Pump Not Heating in Union City

Union City is mostly 1970s through 90s tract housing across Decoto and the central neighborhoods, and a good share of the HVAC out there is on its first or second replacement. When a heat pump in that age range stops heating, it is rarely a single dramatic death. It is a worn part finally giving out: a compressor capacitor that has drifted out of spec, a reversing valve that sticks after years of cycling, or a small refrigerant leak that has slowly bled capacity until the house stops getting warm.

Union City's climate works in your favor here. Winters are mild, the bay moderates the inland edge, and lows rarely threaten a heat pump's heating range. So a unit that cannot keep up on a cool, damp morning is almost always telling you a component failed, not that the weather beat it. For most homeowners one repair brings the system back. We would rather fix the part than sell you a system you do not need yet, and we will say which it is after we measure.

The one case where we will be blunt is age and refrigerant. If the unit still runs on R-22, a refrigerant the industry has phased out, a leak repair gets expensive fast because the refrigerant itself does. On a 25-year-old R-22 heat pump we will lay out repair cost against a conversion side by side and let the numbers make the call.

Common causes

Aged-out capacitor or contactor. On 20-to-30-year-old Union City systems, the run capacitor and contactor are the most common no-heat call. A capacitor that has drifted low leaves the compressor straining or refusing to start; a worn contactor will not pull in the outdoor unit. Both are a meter check and an inexpensive part. We test them first because they fail more often than anything else on aging equipment.

Reversing valve or solenoid failure. Two decades of switching between heating and cooling wears the reversing valve and its solenoid. When it hangs up, the system stays in cooling on a heat call and the house cools off while the compressor runs. We read temperatures across the valve and test the solenoid coil for continuity before deciding whether the fix is a coil swap or the valve body.

Low refrigerant from a slow leak. A small leak bleeds capacity gradually, so the symptom is a heat pump that used to keep up and quietly stopped. We measure superheat and subcooling, locate the leak, and put the charge weight on the estimate in writing. On older R-22 systems we are upfront that the refrigerant cost shifts the math, and we walk you through repair versus conversion before you commit.

Defrost control or coil sensor fault. When the outdoor coil ices over and heat output drops, the defrost cycle is not firing when it should. A failed defrost board or a coil sensor reading off is the usual cause. We compare the sensor's number to actual coil temperature and watch the board's cycle timing on a heat call, so you are paying for a confirmed fault and not a parts-cannon guess.

Backup heat not engaging. Heat pumps with electric strip backup lean on it during defrost and on the coldest mornings. A burned element, a bad sequencer, or a tripped limit leaves the system feeling weak right when you need it. We meter each element and the sequencer at the air handler and replace only what tested bad.

Failed compressor on an end-of-life system. Less common, but on the oldest units a compressor that has lost compression cannot move heat no matter what else is healthy. We confirm it with electrical and pressure testing rather than assuming the worst. If the compressor is genuinely gone on a 25-year-old system, we will tell you straight that replacement usually beats the repair, and lay out what a heat pump conversion would cost.

How we diagnose it

Identify the system age and refrigerant type up front, since R-22 changes the repair-versus-replace conversation.
Meter the capacitor and contactor and confirm the outdoor compressor and fan are starting on a heat call.
Watch the reversing valve switch on a heat call and read line temperatures to confirm it actually shifted into heating.
Measure superheat and subcooling for charge, and inspect the outdoor coil for the ice that signals a defrost fault.
Test backup heat strips, the sequencer, and limit switches at the air handler.

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

Heat Pump Not Heating in Union City: common questions

Do you service Union City, and how quickly?

Yes. Union City sits in our inner East Bay coverage alongside Fremont and Hayward, run from San Ramon. Same-day is best effort and a no-heat call moves to the front of the line. Call (925) 999-4095 and we will give you a real arrival window.

My heat pump is over 20 years old. Is it worth repairing or should I convert?

It depends on the part and the refrigerant. A capacitor or contactor on an otherwise healthy unit is an easy yes to repair. A failed compressor or a leak on an old R-22 system is where conversion often wins. When utility or state rebate programs are open at the time we write your estimate, we will check what you actually qualify for and put real numbers next to the repair, not a sales pitch.

The unit runs but the house never warms up. Is it broken?

Running but not heating usually means the system is not actually in heating mode or has lost capacity. The common culprits are a stuck reversing valve, a low refrigerant charge from a slow leak, or backup heat that failed to engage. We measure supply air temperature and line temperatures to pin down which one before quoting anything.

Nearby and related

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

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