Pilot Light and Ignition Repair in Alexandria, PA
Older boilers run a standing pilot with a thermocouple, which makes the small voltage the gas valve needs to stay open. A pilot that lights and then goes out when you let go of the knob is usually a weak thermocouple.
Newer boilers use a hot surface igniter or spark ignition, followed by a flame sensor that proves the burner lit. A sensor coated in oxide reads too low and the control shuts the gas off after a few seconds. You see the burner light, then die, then try again until the boiler locks out.
Reliable Boiler Service connects Alexandria, PA homeowners with technicians who test these parts with a meter rather than swapping them at random: thermocouple millivolts, flame signal microamps, igniter resistance, gas pressure at the valve.
Smell gas? Leave the house and call your gas utility from outside first.
For pilot and ignition faults, call Reliable Boiler Service at (866) 456-6311.