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Small pilot light on my bosch 10p hot water unit

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Water heaters should be listed under another catagory as it is not in any way shape or form an air conditioner.

Posted on May 21, 2008

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Gas is going to cooking stove in camper. Stove lights. But can't get pilot to light for hot water heater. Don't smell gas coming to pilot area. Furnace is not turning on, but worked fine when...


Chances are good that the thermocouple is bad. It is a small probe that the pilot light keep hot. Take it out and get one at HDepot or at a RV store.

May 27, 2011 | Heating & Cooling

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I turned on hot water to take a bath, and it was hot. by the time the tub had filled the water was freezing. now we cant seem to get hot water out of anywhere. the pilot light is on. the knob is set to on,...


if I was a betting may I would say that this is a small water heater, what is the temperature set on, as the pilot light will be lit once the temperature is reached, but until then the burners will be lit. I would move the temperature knob and listen to see if I hear the burners kick on. Hope this helps Tim

Apr 17, 2011 | Heating & Cooling

1 Answer

The pilot light on my daughter's Worcester 240 combi rsf has gone out - how does she re-ignite it?


Hi, I looked up this unit for you and found out it is a hot water system. She needs to get to the main gas valve to light the pilot. This unit has what is called a thermocouple on it that keeps the pilot on, even when the boiler shuts down. Its just a matter of lighting the pilot light. There should be a metal plate with the directions on it at the gas valve to lite it. You will have a knob, more then likely red or black in color on top of the valve. It will say on, off, and pilot. It should be in the on position now. Turn it to pilot. Have some matches with you and a flashlight if you can. You will need to look back into the burner area to where your pilot light will be. The thermocouple is a copper colored tubing that runs right back to the pilot, as it has to get hot from the pilot flame to work. To start, depending on how far back you have to reach with the match, you may need to use a piece of solid cardboard rolled up, a small piece to light it and reach in. Turn the knob to pilot. Now, push down on the knob and hold it down. This lets gas get back to the pilot, so you must keep it down and light it at the same time. Once it is lite, you have to hold it down for at least a minute. Slowly release it, very slow. The flame should then stay on. Once it is on, turn the gas knob to on. With the thermostat set to come on, it will fire up and heat the water. If the pilot will not stay lite after you hold it down for 1 minute, and keeps going out, the thermocouple will need to be replaced. It is the copper line that screws into the gas valve and goes back to the pilot. You can get them at any hardware store for around $6.00. Maybe you can help her install it. It is very simple to do. I believe the pilot just blew out and she will need to light it. Just follow what I have told you, and she will get it lite. Good Luck to you.
Shastalaker7
A/C, & Heating Contractor

Apr 10, 2011 | Heating & Cooling

1 Answer

Pilot lights but main burner does not light Bosch 10P LP Gas


try by passing thermostat first assuming that it is home heating unit To by pass remove thermostat an connect the red &white togetheir.If main burner lights replace the thermostat. Next step if this fails is to replce the the thermocoupler. This tells the gas regalater that u have apilot.hope this helps let me know.

Apr 10, 2011 | Heating & Cooling

1 Answer

Hi There, We are in a rental property and have a bosch 21e hot water system. We haven't been getting hot water and the gas bottles have been checked and are full. Do we have to light the pilot and are...


You may have a dirty pilot orifice. Try this. Turn off the pilot by turning the control knob to off. Remove the front panel to get access to the pilot orifice. Use a can of compressed air with attached straw (the same stuff you use to clean computer keyboards) and blow out the pilot orifice, which is inside the pilot assembly where the pilot flame burns. Blow it out from the top and from the sides through the air holes. Then relight the pilot and see if that improves the flame size and color (blue) to heat the thermocouple.
Here is a link to the manual and instructions. www.tanklesswaterheatersdirect.com/shop/tanklesswaterheaters/manuals/125B_manual.pdf

Mar 23, 2011 | Heating & Cooling

1 Answer

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...


Flashing red light indicates not enough pressure on the input cold water. I had this problem when the small filter was gummed up with ****. Remove the water input nut and inside is a small removable mesh filter. Also the hydro power unit that you hear whirring has a even finer mesh filter. It can also be cleaned out.

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thre is a sensor thaat goes from the gas valve to the pilot that is called a themocouple change that and you will have no more problem

May 26, 2008 | Heating & Cooling

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