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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 there specific instructions we need to do this. Wanted to check all possible solutions before reporting it to the rental property real estate. As always with rentals there are no instruction manuals left for us to work it out. Kind Regards Janice

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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

Posted on Mar 23, 2011

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We have a gas unit in our ensuite for a hot water we can not seem to get any hot water the gas cylinders are getting low so i have asked for them to be refilled or could i there.


refill the gas bottles and then if that doesn't fix it, get a technician out as it may be the pressure switch not opening the gas so that the pilot light ignites the burner

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I have a bosch system 21e it is, i was told to ignite the pilot light, can you tell me how this is done?


Consult your owners manual.
http://www.bosch.com.au/content/language1/downloads/70R_UserManual1023.pdf
Heres a new one if you don't have or lost yours. You can't, you got bad advice. tankless system don't have a running pilot light. They operate by detecting water flow and then turning on. Many also state on the lighting instructions to NEVER try and manually light the pilot. Try Bosch tech support. Lowes sells Bosch heaters and they might be able to help you get the support number faster. Hope this helps but please don't go sticking a flame inside there.

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My bosh 21e hot water system truns itself off. the only way i can get hot water again is to unplug from power


Best I can offer is troubleshoot resources, including Bosch contact numbers and possible troubleshoot links and possible manual.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

And then you add a comment with solution that worked so others with same problem can read 1 possible answer for their identical problem.
Check back since people occasionally add a comment.

Solve most tankless problems yourself, same day, all brands for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Absolutely feel obligated to upvote the free help.
Or take advantage of fixya paid help.
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How long does it take to reheat water when gas bottle runs out and then you switch to new bottle ?


water getting hot should be almost instant... it may take a minute to move the cold out of the pipes.
is your heater ignighting?
if not then you might have a small amount of air in the gas line when you changed the bottle.
you will need to bleed the line...

with the gas turned on, loosen the gas connection to the unit and let the air out until you smell gas.
tighten the connection, snug, do not over tighten.
wait about 5 minutes for the gas to dissipate before attempting to light the unit.
during this time, you can use a little soap water on the connection you loosened to make sure it is not leaking.

now go turn on your faucets, let the water run for a minute and make sure you get hot water.

if no hot water, then you might have something else wrong. you will need to let us know the error code and what the unit is doing

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these units need lots of flow to start and run. Set the temp on the unit lower and the people in the shower will have to use more hot and less cold which will make the unit more stable.

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