Brand Repair Page
Reznor Unit Heater Repair in NYC
AM Profs Inc diagnoses and repairs Reznor gas-fired unit heaters, duct furnaces, and makeup air units across New York City warehouses, retail spaces, and light-industrial buildings. If a UDAS or UDAP unit needs an igniter or high-limit switch, we start from the actual fault.
24/7 urgent repair is available for Reznor unit heaters, including weekends and holidays — critical for warehouses and retail spaces that depend on them for basic heat.
Covered Equipment
Gas-fired unit heaters (UDAS/UDAP series)
Duct furnaces
Commercial makeup air units
High-limit switches and igniters
Reznor is almost exclusively a commercial and industrial brand — this is not residential equipment, and is common in NYC warehouses, retail spaces, and light-industrial buildings.
Quick Answer
What is the most common Reznor repair issue in NYC?
The most common Reznor calls involve aging UDAS and UDAP separated combustion unit heaters needing high-limit switch or igniter replacements — these are among the most commonly serviced commercial heaters in NYC warehouses and retail spaces, and wear is a normal part of their service life.
Last updated: July 2026
Why Reznor Repairs Need Brand-Specific Service
Reznor is credited with a real industry first: inventing the first successful gas-fired unit heater, which changed commercial and industrial space heating in the early 20th century by moving away from older, bulkier heating methods.
George Reznor founded the Reznor Manufacturing Company in 1888 in Mercer, Pennsylvania, pioneering early gas-fired cast iron heating systems. The brand is currently owned by Nortek Air Solutions, part of Nortek Global HVAC under Melrose Industries.
What Makes The Brand Different
Commercial and industrial only — not residential
Reznor is almost exclusively a commercial and industrial HVAC brand — there's no residential product line here. In NYC, that means warehouses, retail spaces, and light-industrial buildings relying on gas-fired unit heaters, duct furnaces, and makeup air units for basic space heating.
The UDAS and UDAP series of separated combustion unit heaters are among the most common Reznor equipment serviced in the city, and as they age, high-limit switch and igniter wear are the most frequent service needs.
Reznor Systems We Service
Common symptoms, likely causes, what we check first, and when to call for each system type.
Gas-Fired Unit Heater (UDAS/UDAP)
Common symptoms: Unit won't ignite, cycles off on a safety lockout, or blows air without heating.
Likely causes: Igniter wear, high-limit switch fault, or a venting restriction on the separated combustion system.
What we check first: Ignition sequence, high-limit switch operation, and venting path.
What work is done: Igniter replacement, high-limit switch replacement, and venting correction.
When to call: As soon as the unit won't ignite or repeatedly locks out on a safety fault.
Duct Furnace / Makeup Air Unit
Common symptoms: Insufficient heating output, or the unit cycles unexpectedly.
Likely causes: Burner assembly wear, airflow restriction, or a control fault.
What we check first: Burner assembly condition, airflow, and control operation.
What work is done: Burner assembly service, airflow correction, and control component replacement.
When to call: If heating output has clearly dropped or the unit cycles unpredictably.
Frequently Asked Questions
Does Reznor make residential equipment?
No — Reznor is almost exclusively a commercial and industrial brand, focused on gas-fired unit heaters, duct furnaces, and makeup air units.
Why does my Reznor unit heater keep locking out?
This is commonly a high-limit switch or igniter issue on aging UDAS/UDAP series heaters — both are known wear points that need periodic replacement as the unit ages.
Are Reznor unit heaters common in NYC warehouses?
Yes, they're among the most commonly serviced commercial heaters in NYC warehouses and retail spaces.
Who owns Reznor today?
Nortek Air Solutions, part of Nortek Global HVAC under Melrose Industries, owns the brand.
What areas of NYC do you cover for Reznor repair?
We schedule Reznor repair across Manhattan, Brooklyn, Queens, and the Bronx.