Commercial Boiler Repair in Fontana — AC PRO–Supplied Systems

Commercial boiler expertise for Fontana facilities

When heat goes down, operations suffer. Our commercial boiler team restores uptime fast for Fontana warehouses, schools, medical offices, and mixed‑use properties. We service AC PRO–supplied systems and a wide range of hydronic equipment, including high‑efficiency condensing boilers, primary–secondary piping, pumps, expansion tanks, air separators, and modern control sequences. From legacy atmospheric units to advanced modulating condensing platforms, we bring the engineering discipline needed to resolve root causes, not just symptoms.

Targeted diagnostics and repairs we perform

• Ignition and flame‑safeguard systems: hot surface igniters, spark ignition, flame rectification, sensor placement, and control board faults.
• Combustion tuning: gas pressure, air‑fuel ratio, draft, and flue‑gas analysis for stable, efficient burn.
• Pumps and hydronic balance: circulators, VFDs, check valves, air removal, balancing valves, and hydraulic separation.
• Heat exchangers: scaling, fouling, thermal stress, condensate management, and leaks.
• Safety and limit controls: LWCO, high‑limit, pressure relief, gas valves, safeties, and interlocks.
• Condensing systems: condensate traps, neutralizers, proper slope, and corrosion prevention.
• Venting: Category I/IV vent design, draft stability, terminations, and material compatibility.
• Controls and integration: BAS/EMS sequences, outdoor reset, lead‑lag staging, and sensor calibration.

Our process includes visual inspection, sequence verification, electrical testing, and full hydronic and combustion analysis to pinpoint failure modes. Then we correct the fault and verify performance across temperature rise, delta‑P, and combustion values.

Safety, compliance, and healthy indoor air

Your boiler room impacts building health. We confirm combustion air availability, test for CO, and verify venting to keep occupants safe. Our work aligns with California codes and best practices, including Title 24 efficiency considerations and local air quality requirements, while maintaining manufacturer specifications. Healthy air is our mission: proper combustion and ventilation reduce contaminants and help stabilize indoor comfort for staff and visitors.

Preventive maintenance that pays back

• Seasonal inspections and start‑ups with documented readings.
• Water treatment guidance to protect heat exchangers and piping.
• Gasket, trap, and valve checks to prevent leaks and nuisance lockouts.
• Sensor, ignition, and flame verification to avoid no‑heat calls.
• Efficiency tuning to lower fuel spend and extend equipment life.

We tailor PM programs for high‑demand schedules, minimizing disruptions while keeping systems reliable and efficient.

AC PRO–supplied systems and parts

We service commercial boilers and hydronic equipment supplied by AC PRO and similar distributors, ensuring fit‑for‑purpose repairs and replacements that match your design intent. We are experienced with AC PRO–supplied components and can help you source parts quickly through established channels. Note: we are not affiliated with AC PRO; trademarks belong to their respective owners.

4th‑generation engineering pedigree

#1 AC Guys is a family of engineers in its fourth generation with 80+ years of engineering experience. Our team has trained at the factories of Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). We bring that rigorous, manufacturer‑level mindset to boiler diagnostics, commissioning, and repair on complex commercial projects. Whether your challenge is chronic short‑cycling, unstable combustion, or persistent air binding, we deliver clear answers and dependable fixes.

Coverage and dispatch

From our Los Angeles base, we serve Fontana and the surrounding region, including Los Angeles County and nearby areas such as Orange County, Ventura County, and Western Riverside County. We coordinate site access, safety requirements, and documentation to keep your operations on schedule, offering prompt dispatch and streamlined communication with facility teams.

What to expect when you call

• Thorough assessment and a transparent, itemized repair plan.
• Safety‑first approach with documented combustion and system readings.
• Options to stabilize now and optimize long‑term performance.
• Clean, professional work with verified results before we leave.

Ready to restore heat and efficiency? Contact #1 AC Guys for commercial boiler repair in Fontana. Our engineers are equipped to handle urgent outages, complex controls, and challenging hydronic issues—so your building stays warm, safe, and efficient.