Comfortmaker Furnace Parts

Comfortmaker Furnace Parts You Can Count On

Comfortmaker furnaces are part of the ICP family — built with the same engineering as Heil, Tempstar, Arcoaire, and Grandaire. When your Comfortmaker stops heating, the culprit is usually one of a handful of high-failure parts. Hot surface igniters, draft inducer motors, pressure switches, and control boards account for the majority of repairs. The good news: these parts are straightforward to diagnose and replace, and Repair Clinic stocks genuine OEM Comfortmaker parts.

Your model number is the key to getting the exact right part. Comfortmaker furnaces span decades of production, and part variations across model series are common. Use our model number lookup tool to find your specific furnace, then browse the parts list for your repair.

• Furnace won't ignite or igniter glows orange then goes out: Hot surface igniter (SiC or SiN type — verify for your model)
• Pressure switch trips, furnace won't start, or inducer motor sounds rattled: Draft inducer motor assembly or pressure switch (test airflow blockage first)
• Furnace starts briefly then shuts down within seconds: Flame sensor (clean first with fine steel wool; replace if cleaning doesn't restore operation)
• Furnace cycles on/off or overheats: High-limit switch or main control board (IFC board)
• Blower won't run or runs slowly: Blower motor capacitor or blower motor assembly

Comfortmaker Furnace FAQ: Diagnosis & Repair

What's the difference between Comfortmaker, Heil, Tempstar, and Arcoaire furnaces?

They're all manufactured by ICP (International Comfort Products, a Carrier subsidiary) and share the same engineering platform. Parts are often interchangeable across all five brands — the key is matching the part number to your specific model. Always use your model number to confirm compatibility, even within the ICP family.

How do I find my Comfortmaker furnace model number?

The model number is printed on the rating plate, usually mounted on the front panel of the furnace cabinet or on the blower compartment door. It typically starts with letters like CMN, CMD, or similar Comfortmaker prefix. Write it down exactly and use it in our model lookup tool — it ensures you get the right igniter type, control board, motor, and other parts for your exact unit.

My furnace igniter glows but the furnace won't heat. Is it the igniter or something else?

If the igniter glows but gas doesn't ignite, the igniter itself is usually failing. An igniter that glows orange (instead of bright white) or glows but loses power too quickly can't reach the gas valve's trigger temperature. Before replacing the igniter, confirm: (1) gas valve is receiving 24V control signal, and (2) gas is reaching the burner (listen for a faint hiss). If those check out, the hot surface igniter is your part.

Why does my pressure switch keep tripping?

The pressure switch is a safety device that confirms the inducer motor is running and air is flowing. If it trips during startup or won't allow the furnace to run, check first: (1) is the exhaust vent blocked by ice, snow, or debris? (2) is the pressure hose cracked or disconnected? (3) is the inducer motor spinning? If the motor is running, airflow is clear, and hoses are intact, the pressure switch itself has likely failed and needs replacement.

Comfortmaker Furnace Model Number: Where to Look

On Comfortmaker furnaces, look for the model number on the rating plate attached to the blower compartment door or the front panel of the cabinet. Turn off power to the furnace, then open the appropriate access panel and copy the full model number exactly, including letters, numbers, and any hyphens. Do not rely on the serial number, which identifies the unit but does not select compatible parts. Enter the model number in the model lookup to pull up the parts matched to your unit. This filters the complete Comfortmaker furnace parts catalog for your specific model, including controls, igniters, motors, switches, and other parts. That means fewer wrong orders and a faster repair.