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Demand light not on when hot water tap is turned on, so ignition light is not operating.

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What has happened is your starter that senses the pressure, and that sensor when activated, , then ignites the igniter, and the heater works. What happens is this sensor/Valve, goes faulty, and it will not work.It must be replaced. Sometimes too, it is the actual igniter itself, you will have to troubleshoot to see which part it is, it maybe easier to just replace both. have a look on the 'net, for a service manual for your system, it will give you a diagram and all servicing data etc. really you cannot repair anything without one. If in doubt at all though. You should contact a professional, and ask for a 'Quote" for the repair.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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1 Answer

When i turn on the tap the water is cold for 2 minuets then comes hot


Is this a new problem? Is it just running the cold out of the pipes before the hot water shows up? Is it a on demand or tankless system?

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I have a BOSCH 425N tanlkess hot water heater. In order to get hot water to flow to the sink taps, I need to turn more than one tap on (eg. if I want hot water at kitchen sink I must also turn a bathroom...


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No hot water coming out. ignition comes on ,but no lighting of gas. There is gas in bottle and it's on as normal.Works one day , doesn't the next.I cannot remember if there was a pilot light before!


check for pilot but im sure that the pilot is on demand thats what makes these things so cool and inexpensive to operate. try having someone turn on the hot water while looking for ignition. if there is nothing it may be a relay. im not sure but if you open it up check for a 3 amp fuse its green. all the new furnaces with mother boards have a fuse. I am not really a heating guy but i have been looking into on demand systems and sat in a training session at the plumbing supply. never hurts to try and help.
if its not a fuse or the ingniter isnt functioning you may need to call a heating person who knows on demand or check Bosch on line maybe they have the trouble shooting guide if you dont.

sorry that all i can suggest hope it helps

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Hot water wont fire up when hot tap is turned on . but firing up for radiators ok


Check the diverter valve is operating when hot is on demand. Depending on the boiler [valve types differ] most have a small piston [biro refill diameter] protruding which operates an electrical switch/contact.
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I have a Rinnai tankless gas water heater and this things beeping and flashing 12 everytime we turn on the hot water the water will get hot but you have to wait for it to stop beeping


Error 12 is failed ignition - this can be caused by many things, but normally a low gas pressure, or no gas pressure upon ignition.
Try turning the hot tap on very slowly till till the control shows burner is lit. Then turn it on faster. If it stays going with no error, you might have a faulty regulator, not opening fast enough to meet demand. Especially common with lpg models,a lot rarer on natural gas.

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Tankless on demand water heater.


Tankless water heaters normally take a little longer than a regular heater to provide hot water because they have to start and get warmed up. I'm guessing the heater uses a pilot light and that the short amount of hot water when you turn on the tap is hot because when the water is sitting still in the heater the heat from the pilot light is enough to get it hot. The tub faucet will get hot a lot faster than the shower because it lets a lot more water through and empties out the pipes faster than the shower. You could probably speed things up by letting the tub faucet run on completely hot for like 10-15 seconds and then turning on the shower.

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A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

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1 Answer

Electronic water heater burner often won't light tho pilot's on


it sounds like you pilot lite is to far away from the burner, make sure that the burner is sitting in it;s purch, look thru the site glass it can be moved by hitting or bumping into the out side of the gas tubes on the outside of water heater, if not, the burner assembly may have soot on it. you might also want to make sure the filters are not clogged on the shut offs that will give it less pressure then it needs to make the unit come on,, write me , gary1121@aol.com

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