Expert Heating Repair

A furnace that won't ignite or a house with cold spots usually points to a fixable problem. Our Monrovia heating repair technicians troubleshoot ignition systems, blower motors, and thermostats to restore even, reliable heat.

Common Heating Failures We See in Monrovia

  • Hot Surface Igniter Failure: The most common furnace repair in modern gas furnaces. The igniter glows to light the burners; when it cracks, you get no heat. We carry universal and OEM igniters.
  • Dirty Flame Sensor: Carbon deposits build up on the rod and cause the furnace to ignite and then shut off within seconds. A simple cleaning often resolves this immediately.
  • Inducer Motor Failure: The draft inducer motor pulls combustion gases out of the heat exchanger. When it fails, the pressure switch trips and locks out the furnace.
  • Bad Control Board: The circuit board governs the entire ignition sequence. Failed boards can cause random shutdowns, no ignition, or constant blower operation.
  • Cracked Heat Exchanger: A safety-critical failure that can allow carbon monoxide to enter the living space. Always warrants immediate shutdown and replacement.

Honest Diagnostics, Not Guesswork

Our technicians use combustion analyzers, manometers, and digital multimeters to pinpoint the exact root cause of your heating failure — not the first thing they see that might be wrong. We check the entire control sequence from the thermostat signal all the way through ignition, burner operation, and heat exchanger integrity before making any repair recommendation. If we find a cracked heat exchanger, we'll show you with our inspection camera. We believe in transparency, not upselling.

Our Heating Repair Process

We diagnose thoroughly and repair precisely:

  • 1. Full Control Sequence Test: We check the thermostat signal, draft inducer operation, pressure switch continuity, igniter, flame sensor, and rollout/limit switches.
  • 2. Gas Pressure Verification: We measure manifold gas pressure with a manometer to ensure the gas valve is supplying the correct pressure to the burners.
  • 3. Heat Exchanger Inspection: We use an inspection camera and combustion analyzer to check for cracks or incomplete combustion.
  • 4. Written Flat-Rate Quote: Every repair price is provided in writing before the work begins.
  • 5. Post-Repair CO Test: We test for ambient carbon monoxide after every gas heating repair before we consider the job complete.

Why Choose Monrovia HVAC?

Gas appliance repair requires a licensed contractor. We are fully licensed and carry all required insurance. We take your family's safety as seriously as our own.

Call us today at (626) 423-6510 to schedule your service.