Gas Boiler Pilot Light On But Not Firing Up or Takes a Long Time to Ignite & More in Monson, MA. The pilot light will ensure that the gas is constantly being burnt and producing the heat we desire. The way these older gas boilers work means a slow and steady stream of gas is always being fed from the gas pipe. A leak coming from your boiler is never a good sign. take the thermostat off the wall, there are two or more wires (un-plug furnace first) connect the red and white together, tape off all the others, plug in furnace. The pilot light does not go out. What is likely to be wrong and needs testing ? Turn the gas control knob clockwise to OFF. Boiler is leaking. Boiler not firing up after reconnecting gas. There is no indication of what type of boiler it is other than the fact it is a wall hung boiler with Honeywell controls on the boiler. The first issue is that the pilot light will frequently go out and need to be relit. A fairly conventional system. Many gas boilers have flue dampers that open when the burners fire up and close at the end of the cycle. I can hear water moving in the pipes and the flue opens and closing accordingly. It appears that everything is working corretly. It is a simple job, but your question indicates you don't have a lot of knowledge about this particular subject, so get some one in, don't mess with gas. I fixed this the other day by turning the gas stop cock off and on and boom it fired up the boiler!! 3. With heating and water set to ‘off’ the boiler fires up all day sometimes with the pilot light being ignited sometimes not but in each case my smart meter display unit shows that gas is being used. Older boilers will have a pilot light, a small flame that constantly burns before lighting a larger flame when heating or hot water is needed. The pilot light is lit also. The boiler will not fire up if the pilot flame is not detected. Got an ideal w2000 rs30 gas system boiler. Gas boiler. When a home heating system uses a boiler, one of the most common problems you can encounter is when the boiler’s pilot light won’t ignite. The problem I'm having is that the pilot light on the boiler is lit, but will not fire even though the clock/ timer is on CH constant and HW constant, and the thermostat is on high. They thought (90%) they said it was the vent damper, that wasn't opening, so the boiler wasn't firing (as i understand it also signals the boiler to fire) He did not have one, and it was a long weekend so i had to wait anyway, so i ordered the part myself online, for much less money and installed and replaced it myself. If the pilot light goes out then the boiler won’t be able to fire into action. This happens because yellow flames do not burn as hot as blue flames. If you have one the first thing that happens before the burners light is the dampers opens. There should be instructions to light the pilot inside the cover of the boiler, but if not, and you don't have the boiler manual, the VR8200 gas valve manual also has instructions: Quote: Light the Pilot Burner Flame 1. I have a Utica Boiler MGB150HID that the pilot light will come on and stay on but the unit will not flame up. If it isn't opening you can usually find a switch on the damper that can change it from "auto" to "hold open". When I call for hot water or heating the boiler isn’t firing up. February 1, 2019 AmbientHVACAdmin Blog No Comments. hi I had someone out to look at My Slant Fin boiler S-34 DS. There are two main issues with a pilot light burning yellow. Sometimes the gas being used is heavy and sometimes very light. And on and stay on But the unit will not flame up constantly burnt! Stop cock off and on and stay on But not Firing up will come on and stay on the. Flue opens and closing accordingly Fin boiler S-34 DS flue opens and closing.... 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