new thermal couple...last week i had noticed the damper (automatic) was in the closed position. i nudged it a bit and it opened and the boiler fired...needed to fix a radiator pipe and shut it down...now it won't fire. mounted on the boiler is..pilot unit (works) a control box when i turned on the circulating pump a grey switch inside moved. that no longer is the case...near that a small box with a red button (like a reset button) pushed it nothing happens...wires from the control box to round black unit that controls the damper automatically. i manually opened the damper....3 other boxes mounted to pipes controlled by thermostats...there is power to these..any help before i call in a professional would be appreciated
The button that you pushed is the reset for the flame safety that makes the boiler follow a start up procedure and looks at the fire to make sure it is on. The boiler should have some gas pressure switches on it that often go bad, check these. Also, the damper and other items need to be in the correct position to have the boiler purge and fire. The blower also has a pressure switch on it that is a permissive for firing. There is also a high temperature limit someplace on the unit too. If you are electrical type try to follow the schematic and see if you have power in the circuit. Turn everything off, power down and then turn the power back on and start through the start up sequence. Follow the schematic with testers to see which switch or whatever is bad.
