Question about Bosch AquaStar 125FXKIT-NG 125FX Natural Gas Tankless Water Heater w/ Hood
The pilot lights the emission array momentarily then it seems to run out of gas supply, then the pilot tries again, lighting momentarily then again goes out, seeming to run out of gas supplied. I think it might be a sensor telling it not to supply gas, or maybe a regulator that may need to be turned up? I see a spot on what looks like a regulator (manifold?) that has a groove on the front of it that looks like it may be adjustable with a flat blade screwdriver.
DO NOT try to adjust gas pressure unless you have the appropriate tools and gauges to do it right. You don't want to burn your house down.
First make sure all of the gas valves are fully opened. If that checks out and the problems continue, call an HVAC technician or your gas supplier to have them evaluate the adequacy of the supply line as well as the gas pressure at your appliance. Go with whatever they say or ask you to do.
Posted on May 24, 2009
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Posted on Jan 02, 2017
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The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.
The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced
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