The short answer
Newark furnace problems most often involve ignition parts, flame sensors, pressure switches, blocked condensate drains, rusted components or worn blowers. ClearSky tests each stage of operation, checks venting and the heat exchanger and explains repairs before starting, so you know exactly what is being fixed and why.
Newark winters are not severe, yet the chill that settles in with fog and rain off the Bay can make a house feel cold for days. Furnaces in the 94560 ZIP code tend to run in short bursts on damp mornings and evenings, and the moisture in the air plays a role in how they wear. ClearSky Heating & Cooling repairs standard and high-efficiency gas furnaces across Newark, roughly 10 miles northwest of our San Jose base. We test the furnace from thermostat to flue, repair what has actually failed and confirm it is burning and venting safely before handing it back to you.
Before a Technician Arrives
A few safe checks can sometimes restore heat or at least give us useful information. Make sure the thermostat is set to Heat with a setpoint above room temperature. Confirm the furnace switch, which often looks like a light switch near the unit, is on. Check the filter and replace it if it is clogged, since restricted airflow can trip a safety limit.
Many furnaces have a small window showing a blinking status light. Counting the blinks and noting the pattern helps us narrow down the fault. Avoid resetting the furnace over and over. Repeated restarts after a lockout can mask a problem or, with ignition faults, let unburned gas build up.
Standard and High-Efficiency Furnaces Fail Differently
Standard-efficiency furnaces vent hot exhaust through a metal flue. Their common problems include worn ignitors, weak flame sensors, failing inducer motors, cracked heat exchangers and rust on burners or flue connectors.
High-efficiency condensing furnaces cool the exhaust enough to pull water out of it, so they vent through plastic pipe and drain condensate continuously. That drain is a frequent failure point. A clogged trap or line backs water into the furnace and trips the pressure switch, which stops ignition. Intake and exhaust pipes that terminate outside can also be obstructed by debris, nests or, in some installations, wind pushing against the vent.
How Damp Bay Air Shows Up Inside a Furnace
Furnaces in garages, crawlspaces and closets on exterior walls are exposed to the humidity that comes with living near the shoreline. Over time, that moisture can rust burner trays, the bottom of the heat exchanger, flue connectors and screws that hold access panels. It can also corrode wire terminals and the flame sensor itself.
During each repair we look for moisture-related damage. Light surface rust may only need cleaning and monitoring. Corrosion that has eaten through metal on a heat exchanger or flue is a safety issue and needs to be addressed.
What We Typically Repair
Every repair begins with confirming the fault through measurement, but these are the repairs we perform most often on Newark furnaces.
- Cleaning or replacing flame sensors
- Replacing cracked or weak hot surface ignitors
- Clearing condensate traps, lines and pressure switch tubing
- Replacing inducer motors and pressure switches
- Repairing or replacing blower motors and capacitors
- Diagnosing control boards and thermostat wiring
- Inspecting heat exchangers, flues and vent terminations
Deciding Between Repair and Replacement
A single failed part on a furnace in decent overall condition is usually worth repairing. A cracked heat exchanger, a string of major repairs or widespread rust often shifts the balance. We give you an honest assessment and the information to decide.
You are not required to replace a working furnace under Bay Area Air District rules; they apply when equipment fails or is replaced. Under Rule 9-4, gas furnaces manufactured from 2029 must meet a zero-NOx standard, which points future replacements toward heat pumps. If that interests you, we can review your ducts and panel and point you to BayREN and local clean energy programs, confirming any current incentive before quoting it. We also repair furnaces in Fremont, Mountain View, Sunnyvale, Milpitas and Los Altos.
More services in Newark
- AC Repair in Newark
- Heating Repair in Newark
- Heat Pump Installation in Newark
- AC Installation in Newark