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Bosck Water Wizard not getting hot

We have a Bosch Water Wizard that lights up when a tap is turned on but will not get hot enough. Any ideas to rectify this problem.

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Bosch 780 main burner is not starting when tap is turned on. Pilot is working

Posted on Mar 14, 2012

It sound like you control box. I had the same problem. I had to buy a new one. Price aroud $250.

Posted on Sep 28, 2008

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There was no hot water so repressurised as the pressure wass low the red light remained on but occassionally when turn hot tap on the green light comes on there is hot water then it shuts down and red...


These sure were not out for long. The bright red button is a pressure release valve which could be faulty hence allowing water to bypass out of the system and not having hot water. Try strapping a bag around the pipe that goes outside and see if it fills with water. To top up your system look on the pipes just below the boiler. There should be a cold filling loop or a connection for one. If not get one from a plumber and ask them how to fill system up, its straight forward enough and your problem should be fixed with this info

let me know if you have further questions

my best to you

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System drained at end of last season to prevent burst water pipes. Now have air in the system. Water comes out of taps in great spurts. How do I solve this? Bosch Gas water heater W135 in a...


I use the bathtub to keep the splatter contained, and turn the hot tap on full first and let it run until you get a good air free flow. Then do cold tap and do same. Then do all taps same. Where is water being drawn from?

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Do I need to replace the thermocoupling on my Reliance 501 gas water heater? Model is 5 30 NOMT7 C. Recently, I've noticed an intermittent problem with the the hot water not staying consistent. So we're...


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The hot water tap in the kitchen broke. We turned the hot water off coming out of the tank. The stop **** has been reopened. The tap has been repaired but we cant get any water through


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Hope this helped to solve your problem, Eddie. Please be kind enough to rate my response. Thanks!

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My Rinnai 24 will only start when I use the the hot water in the kitchen (which is closer to the heater). If I open any of the hot water taps in the bathroom it doesn't work.. I have to start the hot water...


Looks like your recirculation pump might be bad. If your opening a valve close enough to the heater and it comes on, It sounds like it's giving your pressure switch a false reading and allowing it to come one while the farther away you get, it is not enough line pressure to overcome the safety's of the heater.

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1 Answer

We have Rinnai 18 instant hot water service. We have no hot water. Pilot light appears to have gone out. When I turn on hot water tap the temperature on key pad flashes at 19 degrees instead of 55


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when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

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Hi, I have a Bosch WR250 tankless gas instant water heater. My problem is i am not getting a spark at the pilot when the hot water is turned on,the red light flashes after 10sec. I can here the...


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