Weil-McLain Boiler Repair & Emergency Diagnostics

A clicking boiler that fails to light indicates an electronic ignition lockout. This is typically caused by a dirty or oxidized flame sensor rod, a cracked silicon carbide or direct spark igniter, an air intake blockage, or insufficient gas pressure at the manifold. We test flame rectification microamps and gas manifold pressure to pinpoint the root cause.

The pressure relief valve opens as an emergency safety release when system pressure exceeds 30 PSI. The most frequent culprit is a waterlogged diaphragm expansion tank that has lost its 12 PSI air pre-charge, causing boiler water to expand with nowhere to go. Other causes include a failed automatic water feeder or internal coil pinhole leak.

Steam radiator banging (water hammer) occurs when rising steam encounters pooled condensate water in the steam main. In Weil-McLain steam boilers (like the EG series), this is frequently caused by boiler water surging or priming due to surface oils, an improper header height, a sagged steam main, or blocked air vents.

Requesting a consultation and phone assessment is handled promptly by our dispatch desk. Our dispatch desk aims to contact completed requests within 5 minutes. If an on-site visit is scheduled, our technician performs a comprehensive mechanical, electrical, and combustion evaluation before presenting upfront, transparent repair options.

Yes. Our service vans carry universal and OEM-spec components including Taco and Grundfos circulators, Resideo/Honeywell gas valves, Hydrolevel and McDonnell & Miller low-water cutoffs, pressure relief valves, ignition modules, and digital combustion analyzers.