Fast, reliable fixes that restore heat and safety to your home or business.
5 Highlights on Boiler Repair
Boiler repair is the diagnosis and correction of faults in heating boilers that prevent proper combustion, circulation, or heat output. Our technicians troubleshoot error codes, replace faulty components like gas valves and ignition electrodes, and restore full function to condensing boilers, system boilers, combi boilers, and floor-standing units. We handle lockouts caused by flame sensor failure, pressure drops from leaking valves, and kettling from scale buildup in heat exchangers. Every repair includes combustion analysis with a flue gas analyzer to confirm safe operation and optimal efficiency. PJ MAC HVAC Service & Repair stocks common spare parts on every van, cutting downtime and getting your heating back online fast.
- Emergency call-out service available 24 hours for no-heat situations and gas leaks
- Combustion testing with calibrated analyzers ensures safe CO/CO₂ ratios and proper draft
- Genuine OEM parts from manufacturers like Navien, Weil-McLain, and Lochinvar
- Pressure testing and tightness checks verify system integrity after valve or pipe repairs
- Warranty-compliant work protects your manufacturer coverage and meets building code
Why Choose Our Boiler Repair
Boiler repair demands Gas Safe registered technicians who understand burner controls, flame rectification circuits, and hydronic system hydraulics. PJ MAC HVAC Service & Repair employs licensed heating contractors with manufacturer certifications across major brands. We carry diagnostic tools including manometers for gas pressure testing, multimeters for electrical troubleshooting, and thermal imaging cameras for leak detection. Our vans stock gaskets, thermocouples, ignition transformers, circulator pumps, and expansion vessels so most repairs finish in one visit.
We don't just swap parts. We investigate root causes, check flue draft with a smoke test, verify inlet and outlet pressure at the gas train, and measure flow and return temperatures to confirm balanced operation. Every service includes a written report with combustion readings, safety checks, and recommendations for system improvements. We provide upfront quotes before starting work, honor our labor warranty for twelve months, and offer maintenance contracts that include annual servicing with priority scheduling for breakdowns.
Signs You Need Boiler Repair
Boiler repair becomes necessary when your unit locks out repeatedly, displays fault codes, or fails to ignite. A common symptom is short cycling, where the burner fires for thirty seconds then shuts down, often caused by a faulty flame sensor that can't detect ionization current or a blocked condensate trap that triggers the high-limit thermostat.
Common Symptoms
Kettling: Sounds like a boiling kettle inside the combustion chamber, indicating scale deposits on heat exchanger surfaces that restrict water flow and cause localized overheating. This requires descaling or heat exchanger replacement.
Low System Pressure: Below 1 bar prevents circulation and triggers a low-water cutoff, usually from a leaking pressure relief valve, corroded radiator valve, or failed expansion vessel diaphragm.
Cold Radiators: Radiators staying cold while the boiler fires points to a seized circulator pump, air lock in the primary circuit, or stuck zone valve that won't open.
Water Leaks: Visible water pooling beneath the boiler casing signals leaking pipe joints, a cracked heat exchanger, or a failed pump seal that needs immediate attention to prevent flooding and further corrosion.
Intermittent Hot Water: With the burner cycling on and off rapidly suggests a faulty NTC sensor sending incorrect temperature readings to the control board, or a blocked plate heat exchanger in combi boilers reducing flow rate.
Fast, reliable fixes that restore heat and safety to your home or business.
5 Highlights on Boiler Repair
Boiler repair is the diagnosis and correction of faults in heating boilers that prevent proper combustion, circulation, or heat output. Our technicians troubleshoot error codes, replace faulty components like gas valves and ignition electrodes, and restore full function to condensing boilers, system boilers, combi boilers, and floor-standing units. We handle lockouts caused by flame sensor failure, pressure drops from leaking valves, and kettling from scale buildup in heat exchangers. Every repair includes combustion analysis with a flue gas analyzer to confirm safe operation and optimal efficiency. PJ MAC HVAC Service & Repair stocks common spare parts on every van, cutting downtime and getting your heating back online fast.
- Emergency call-out service available 24 hours for no-heat situations and gas leaks
- Combustion testing with calibrated analyzers ensures safe CO/CO₂ ratios and proper draft
- Genuine OEM parts from manufacturers like Navien, Weil-McLain, and Lochinvar
- Pressure testing and tightness checks verify system integrity after valve or pipe repairs
- Warranty-compliant work protects your manufacturer coverage and meets building code
Why Choose Our Boiler Repair
Boiler repair demands Gas Safe registered technicians who understand burner controls, flame rectification circuits, and hydronic system hydraulics. PJ MAC HVAC Service & Repair employs licensed heating contractors with manufacturer certifications across major brands. We carry diagnostic tools including manometers for gas pressure testing, multimeters for electrical troubleshooting, and thermal imaging cameras for leak detection. Our vans stock gaskets, thermocouples, ignition transformers, circulator pumps, and expansion vessels so most repairs finish in one visit.
We don't just swap parts. We investigate root causes, check flue draft with a smoke test, verify inlet and outlet pressure at the gas train, and measure flow and return temperatures to confirm balanced operation. Every service includes a written report with combustion readings, safety checks, and recommendations for system improvements. We provide upfront quotes before starting work, honor our labor warranty for twelve months, and offer maintenance contracts that include annual servicing with priority scheduling for breakdowns.
Signs You Need Boiler Repair
Boiler repair becomes necessary when your unit locks out repeatedly, displays fault codes, or fails to ignite. A common symptom is short cycling, where the burner fires for thirty seconds then shuts down, often caused by a faulty flame sensor that can't detect ionization current or a blocked condensate trap that triggers the high-limit thermostat.
Common Symptoms
Kettling: Sounds like a boiling kettle inside the combustion chamber, indicating scale deposits on heat exchanger surfaces that restrict water flow and cause localized overheating. This requires descaling or heat exchanger replacement.
Low System Pressure: Below 1 bar prevents circulation and triggers a low-water cutoff, usually from a leaking pressure relief valve, corroded radiator valve, or failed expansion vessel diaphragm.
Cold Radiators: Radiators staying cold while the boiler fires points to a seized circulator pump, air lock in the primary circuit, or stuck zone valve that won't open.
Water Leaks: Visible water pooling beneath the boiler casing signals leaking pipe joints, a cracked heat exchanger, or a failed pump seal that needs immediate attention to prevent flooding and further corrosion.
Intermittent Hot Water: With the burner cycling on and off rapidly suggests a faulty NTC sensor sending incorrect temperature readings to the control board, or a blocked plate heat exchanger in combi boilers reducing flow rate.
