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Heating Repair for Dublin Households

The short answer

Start with the thermostat, breaker, filter and furnace door switch. If the heat still will not come on, the cause is usually ignition, sensing, airflow, drainage or a heat pump control fault, and we diagnose it on site and explain the fix first.

No heat is never convenient, but in Dublin it tends to happen on the first truly cold week of the season, when everyone in the Tri-Valley switches on the thermostat at the same time and discovers what went wrong over the summer. EliteFlow HVAC Repair Service handles heating repair across 94568, coming down from our Danville base about 6 miles north. This page is written as a troubleshooting guide. It starts with what you can check yourself in a few minutes, moves to what each symptom usually means for gas furnaces, heat pumps and ductless systems, and ends with what we do differently when we arrive.

Five-minute checks before you call

A good share of no-heat calls are solved by something simple. Running through this list first can save you a visit, or at least give us useful information.

  • Thermostat: set to heat, set several degrees above room temperature, fresh batteries, and the schedule not overriding your setting.
  • Breaker: check the furnace or air handler breaker and any outdoor heat pump breaker. Reset a tripped breaker once only.
  • Service switch: the light-style switch on or near the furnace is sometimes turned off by accident.
  • Filter: a badly clogged filter can trip the furnace's high-limit safety and stop the heat.
  • Door panel: furnaces have a safety switch that keeps them off if the lower panel is not seated firmly.
  • Outside vents: on high-efficiency furnaces, the white plastic pipes outside must be clear of leaves, nests and debris.

If you have a gas furnace

Pay attention to what the furnace does when the thermostat calls. If you hear the inducer fan but nothing lights, think pressure switch, vent blockage or, on condensing units, a clogged drain. If the burners light and drop out within seconds, the flame sensor is the leading suspect. If burners stay lit but air does not move, the blower motor or its capacitor may have failed.

Look for a blinking light through the small window on the furnace door. Counting the flashes and comparing them to the chart inside the panel can point straight at the failed component, and it is very helpful to tell us that code when you call.

If you have a heat pump

Heat pumps fail differently. Ice that keeps building on the outdoor coil without clearing usually means the defrost system is not working, often a sensor, a control board or the reversing valve. If the indoor unit blows cool air while the outdoor unit runs, the system may be stuck in cooling mode or low on refrigerant. If the house falls behind only on the coldest mornings, the auxiliary heat may not be engaging.

One common Dublin scenario: a homeowner replaced the old thermostat with a smart model, and it was never configured for the heat pump's reversing valve or backup heat. The equipment is fine; the settings are wrong. We check that first, because it is the quickest fix there is.

If you have a ductless system

For mini-splits, check that the remote has fresh batteries and is in heat mode, and that the indoor head's filters are clean. A blinking indicator light on the indoor unit usually corresponds to an error code. Most ductless heating problems we see come from dirty filters and coils, sensor faults or communication errors between the indoor and outdoor units.

What our visit looks like

We arrive with the common parts for your type of system. The technician confirms your description by running the heat and observing each stage, then tests the specific components involved, from igniters and flame signals to refrigerant pressures and defrost controls. We also check airflow and duct connections, since cold rooms are often a distribution problem rather than a heater problem.

You get a clear explanation of the cause and your options before work starts. If the equipment is aging, we will lay out repair against replacement. For context, the Bay Area Air District rules do not require replacing working equipment, and they apply only when a furnace or water heater fails or is replaced. Under Rule 9-4, gas furnaces manufactured from 2029 must meet a zero-NOx standard, which in practice points toward heat pumps for replacements after that date.

Emergencies

If you smell gas, do not touch light switches; leave and call the gas utility from outside. If a carbon monoxide alarm sounds, get everyone outside and call the fire department. If you notice a burning electrical smell from the furnace or air handler, turn it off at the breaker and call us. We also cover Pleasanton, San Ramon and Livermore.

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What to expect

How a visit goes

  1. Clear findings

    We show you the failed part or the reading that points to it, and explain what it means for the rest of the system.

  2. Choices, not pressure

    Repair, replace or wait and watch: you get the trade-offs of each and make the call yourself.

  3. Care for your home

    Shoe covers, drop cloths and a clean work area when we leave, whether the job was in the attic, garage or hall closet.

FAQ

Common questions

My furnace blinks a code. What does it mean?

Most furnaces have a chart inside the panel door that translates the blink pattern. Tell us the code when you call so we can bring the likely part.

Why is my heat pump covered in frost?

Light frost on cold, damp mornings is normal and should clear during a defrost cycle. Heavy ice that keeps building means the defrost system needs service.

Can a new thermostat stop my heat from working?

Yes. Heat pumps in particular need the thermostat configured correctly for the reversing valve and auxiliary heat.

Is a space heater safe to use while I wait?

Used carefully, yes. Plug it directly into a wall outlet, keep it clear of bedding and curtains, and turn it off when you leave the room.

Do you repair mini-splits as well as furnaces?

Yes, we repair gas furnaces, ducted heat pumps and ductless systems throughout Dublin.

What areas around Dublin do you serve?

All of 94568, plus Pleasanton, San Ramon, Livermore, Walnut Creek and Moraga.

Tell us what your system is doing

Describe the noise, the smell or the temperature problem when you reach out, and we will schedule a technician with the right parts for your equipment.

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