Every furnace call starts with a combustion and carbon monoxide safety check, not just a symptom fix.
Heat exchanger cracks, ignitor failures, and gas valve issues all fall within our scope.
If you're dealing with a pilot light that won't stay lit, an ignitor that clicks but never catches, or a furnace that runs but blows cold air, you already know furnace failures carry a safety dimension — carbon monoxide and gas leaks — that most other HVAC repairs don't, so the diagnostic has to start there.

Most furnace repair problems give some warning before they turn into a pilot light that won't stay lit, an ignitor that clicks but never catches, or a furnace that runs but blows cold air — catching it early usually means a shorter, cheaper fix.
AAA Pro HVAC built its furnace repair process around one idea: diagnose first, quote honestly, fix it right.
We're licensed, insured, and staffed with techs who've spent years specifically on furnace repair, not general handyman work with an HVAC certificate bolted on.

Every furnace visit includes a combustion analysis and carbon monoxide test before any repair recommendation.
We carry manufacturer service manuals for major furnace brands.
Diagnosis happens first, and the quoted flat rate reflects the actual confirmed fault.
No-heat calls during freeze warnings get moved to the front of the schedule.
From the first symptom to the final fix, these are the specific furnace repair services our Marshfield-area crews are equipped for.
Hot surface ignitors crack over time and simply stop glowing — we test resistance rather than replacing on assumption. Techs handling ignitor & pilot light repair carry the specific parts and tools this job calls for, not a generic kit.
A gas valve that won't open or won't seal is tested with proper manometer readings, not just listened to. This is one of the most requested furnace repair calls we get across Marshfield, WI.
We use a combustion analyzer and visual borescope inspection, not guesswork. Techs handling heat exchanger inspection & repair carry the specific parts and tools this job calls for, not a generic kit.
A furnace that runs but never blows warm air often traces to a blower motor or limit switch fault. This is one of the most requested furnace repair calls we get across Marshfield, WI.
We inspect the full flue run, not just the connection at the furnace. Techs handling flue & venting repair carry the specific parts and tools this job calls for, not a generic kit.
We test low-voltage circuits before condemning the board. This is one of the most requested furnace repair calls we get across Marshfield, WI.

Gas odor reports get immediate safety instructions before dispatch details.
Techs arrive with combustion analyzers and common ignitor/gas valve stock loaded.
Safety check first — combustion and carbon monoxide — then full mechanical diagnostics.
Heat exchanger findings are documented clearly regardless of outcome.

Furnace kept clicking like it wanted to light and never catching.
Turned out to be a failed gas valve — they caught it with a proper pressure test, not a guess.
Shut the furnace down immediately for safety and walked me through the options.
Thermocouple was the culprit, replaced and tested before the tech left.

A clicking-but-not-lighting pattern is one of the most common furnace complaints we diagnose.
Yes — it's a genuine carbon monoxide risk and we treat it as a safety issue, not a routine repair line.
This symptom shouldn't be ignored since it sometimes points to a safety-related fault.
Electric resistance furnaces fail differently than gas units, and we diagnose accordingly.
Immediately — leave the area and call, don't attempt to diagnose it yourself.
No-heat calls during freeze warnings are prioritized across Marshfield, WI.

Whether you're in the heart of Marshfield or one of the surrounding communities, dispatch routes the closest available technician.
☎ Call +1-866-805-8548 for Marshfield Service