Furnace Pressure Switch Hose Repair in Innisfil

Furnace Project, Innisfil

A Furnace That Wouldn’t Run: Pressure Switch Fault in Innisfil

The homeowner called us because their gas furnace had stopped working. The inducer motor was running, but the furnace kept showing a pressure switch fault and wouldn’t go any further. The cause turned out to be a small one: a dried-out, cracked section of the pressure switch tubing.

• Problem: Furnace not operating, pressure switch fault
• Equipment: Goodman gas furnace, 80,000 BTU/h input
• Location: Innisfil, Ontario
• Fix: Damaged tubing section repaired, combustion tested
• Completed: October 2026

The Diagnosis

Inducer Running, Pressure Switch Not Closing

On a call like this we start with the startup sequence. The inducer motor came on as it should, so the problem sat further down the line. The control board was reporting a pressure switch fault, which means the furnace wasn’t seeing the draft it needs before it lights.

From there we checked the rubber tubing that runs from the inducer housing to the pressure switches. That’s the area in this photo.

The Repair

A Cracked Hose, Cut Out and Repaired

The tubing had dried out and split. You can see the crack in the piece we removed. A gap that small is enough to throw off the pressure reading, so the switch never got the signal to close.

We repaired the damaged section and restarted the furnace. It went through its normal sequence and the house had heat again.

After the Restart

Combustion Testing and a Note on Condition

Once the furnace was heating, we ran a combustion test. Carbon monoxide in the exhaust measured about 45 ppm.

While we had the panels off, we also saw noticeable rust and corrosion around the heat exchanger area and inside the blower compartment. We told the homeowner to keep an eye on the furnace and recommended a further inspection of its condition.

Project summary: a gas furnace repair in Innisfil, Ontario, completed in October 2026. A pressure switch fault was traced to cracked pressure switch tubing, the damaged section was repaired, heating was restored and a combustion test was done. Corrosion seen near the heat exchanger and in the blower compartment was flagged for follow-up.