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If the furnace made a clicking noise trying to turn on and then makes the BANG noise at the furnace, it’s most likely a delayed ignition. Imagine a room full of gas and then someone decides to light a match. Big problem. That's what’s happening in your furnace if the ignition of gas is delayed.
A variety of issues can delay the combustion of that gas. So the gas builds up in the furnace until—BOOM—it ignites, causing a mini-explosion. This can harm the heat exchanger, which is very expensive part to replace. Some causes of delayed ignition includes:
1. Dirty burners 2. Flames are lifting away from the burner outlet due to too much primary air 3. Too much gas
If you're handy enough to understand what I've said then burners can be cleaned/replaced, and primary air can be adjusted. With some units gas flow can be adjusted as well; other times the gas valve will need to be replaced.
If you've no idea what I've described, GET HELP before you ruin the heat exchanger and have a more expensive problem on your hands or worse...
If the furnace made a clicking noise trying to turn on and then makes the BANG noise at the furnace, it’s most likely a delayed ignition. Imagine a room full of gas and then someone decides to light a match. Big problem. That's what’s happening in your furnace if the ignition of gas is delayed.
A variety of issues can delay the combustion of that gas. So the gas builds up in the furnace until—BOOM—it ignites, causing a mini-explosion. This can harm the heat exchanger, which is very expensive part to replace. Some causes of delayed ignition includes:
1. Dirty burners 2. Flames are lifting away from the burner outlet due to too much primary air 3. Too much gas
If you're handy enough to understand what I've said then burners can be cleaned/replaced, and primary air can be adjusted. With some units gas flow can be adjusted as well; other times the gas valve will need to be replaced.
If you've no idea what I've described, GET HELP before you ruin the heat exchanger and have a more expensive problem on your hands or worse...
The thermocouple keeps the pilot light on. If the flame blows out it shuts off the gas to the pilot lite only the board that has the igniter on it supplies power to open the main burner as long as the igniter is operating. Sounds like the gas valve is nor working.
Did he check the Pressure switch was it filled whit water can you make the switch open on the pressure switch when blowing on it? Is the hose from the inducer motor opened and not blocked ? also if there is a block after the inducer motor it will not Ignite. If the Tech does not know how to check a pressure switch get a new tech.
Hello, if all the burners are not firing up then they must be cleaned out, usually dirt gets in the crossover parts of the burner and the gas cant flow to all the burners and therefore the flame sensor will turn off the furnace for safety. Clean the burners out this should fix the problem.
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