Question about Bosch 1600H-LP Liquid Propane AquaStar AquaStar Liquid Propane Tankless Water Heater

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Flue vent fan does not always come on at ignition.

Seems to get out of sync after the hot water has been turned on and off repeatedly as when rinsing dishes in the kitchen.

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  • Bosch Master
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Copy following link to troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
Add a comment and give product model and type, and include what has been done so far, and when you last had maintenance, and if this is new unit or older unit, for better identification of product and problem.

Posted on Jul 16, 2013

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Posted on Jan 02, 2017

  • 234 Answers

SOURCE: Bosch Pro tankless water heater overheating

The vent pipe you use is the correct size for the heater.Longer runs require bigger pipe.I also would check to see if the water is getting to hot.

Posted on Mar 16, 2009

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I have a bosch 13p and the pilot light keeps going out I don't know if is the thermocouple or not as it stays alight for hours then dies. It is in a sheltered area and i have checked for blockage.


Get more air to the unit.
http://waterheatertimer.org/pdf/Bosch_Ventilating_tight_houses.pdf
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
Don't use household vent fans.
Trim back trees, and move stuff away from front of water heater and from around vent pipe.
Pilot outage can be caused by tightly insulated house, poor upward draft on flue, other vents or vent fans drafting air upward and causing downdraft on water heater, wind coming down flue pipe, water dripping down flueway, dirty combustion parts, clogged pilot orifice, failed thermocouple, failed gas control valve, low gas pressure, water or air in gas line, super hot location ... or combination of more than 1 thing.

Feb 24, 2013 | Bosch Water Heaters

2 Answers

My reliance sta-kleen 502 is leaking. The water is dripping on top of the pilot light, extinguishing the flame . Please advise me with step by step instructions to diagnose and attempt fix this myself....


If you have a leaking water heater there is a serious problem.
http://waterheatertimer.org/Water-heater-leaking.html
Page shows how to limp along on a leaking water heater if your water heater needs replacement.

One of three things is causing the water:
1) Loose water connection on top of tank that is dripping down inside tank >> check pipes on top of tank.

2) The vent is clogged or not working correctly causing condensation inside flue pipe.
Condensation water is dripping back down inside tank.
Problem means possible CO poisoning if gas is not venting.
Look at vent pipe to see if joints are corroded.
Use long fireplace match > light match and put into draft hood at top of tank and see if smoke goes up.
Put hand at draft hood opening when water heater turns on to see if vent gas enters home.
Do same test when furnace turns on to see if furnace vent is pushing back into water heater.
Does water heater vent inside same pipe as furnace? You may need to set up separate vent for water heater if furnace gasses are pushing back into home.
Check furnace vent for obstructions.
Look at vent stack top of home to see if hood is in place.
Check if bird nest is built inside warm vent pipe.
Improper flue is top priority for getting fixed so vent gasses properly escape home.
You may have to call a plumber.
Professional plumbing forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

3) Your water heater is rusted out.
A rusted tank has to be replaced.
It cannot be repaired.
However, before replacing tank, you do not want a tank failure where tank ruptures and water runs inside home until water is shut off.
This will cause major damage.
Protect yourself first.
Turn off water valve above tank.
Move gas knob to 'pilot' so burner is not heating water.
Open tub spout on hot side to relieve pressure on tank so it will not rupture.

Now you're protected.
Link above shows how to limp along on failed tank until you can replace heater.

You need a new gas water heater from Lowes or Home Depot
Look at label on side of you tank for gallons and btu's of your water heater.
Measure height to flue pipe so you get same height water heater, so pipes don't have to be changed.
You need a pipe wrench and teflon tape which will be wrapped on each pipe thread when pipes are reassembled.

Step1) Drain water heater using valve at bottom of tank.
http://waterheatertimer.org/Water-heater-will-not-drain.html

2) Turn off gas valve going into heater.
When gas valve is perpendicular to gas line, then gas is off.
Dissemble gas line to water heater.

3) Disconnect flue pipe and support flue pipe with wire so it doesn't not fall down. Flue pipe joints should be held together at each joint with 3 screws.

4) Turn off water. Shut off valve is on COLD side.
Disconnect water pipes.

5) Move old water heater out of way.

6) Set new water heater in place. Put water heater in drip pan.

7) Connect water pipes >> cold goes to side marked cold.
Hot to hot.
Buy new flexible water connector pipes at home center for easy installation of water pipes.

8) Connect gas line exactly as it was connected before.
Home center sells flexible gas line connector for easy installation of gas line.
To test for gas leak after installation, mix liquid soap with water and put around gas line joints to see if there are bubbles.
Natural gas has less pressure than water lines, so gas pipes are easy to seal with ordinary wrench.

9) install TP pipe that runs to floor. Use old one off old heater.

10) Fill tank completely with water until water is coming out of tub spout.

11) Turn on gas, and light pilot as shown in manual.
New gas heater sometimes have small water leak when first fired up, so ignore a bit of water.

12) Save water heater manual like it is gold, and read everything in manual.

Dec 18, 2010 | Water Heaters

1 Answer

Boiler Venting.


There cannot be controlled venting of the flue , the products of combustion must have free flow to escape , The heat exchanger is above the burner which heats the water if you thinks this is high then maybe you a pressure problem . Or contact the makes tech line and ask them what they think the consumption might be for you heater .You may find this on google

Mar 22, 2017 | RTO W4 A.O Smith Gas Hot Water Heater...

1 Answer

Back flow of fumes


your on demand water heater is supposed to be on a seperate vent, directly outside,and not closer then 60 inches from any other vent, the on demand pulls cold air in on the outer side of the vent and blows the hot air out the center of the flue

May 25, 2009 | RTO X-40 High Output On-Demand water...

1 Answer

The water heater will cycle 5-6-7 times with no probles then it fails ignition. The water heater is a rheem 50 gal power vent 2. It is about 2 years old.


there is a screen around the bottom of the unit? if so take it off and clean it,, does this unit have a self ignitor, or is it piliot? make sure your flue is clear so the unit is not over heating,, make sure on the power vent that the filter is clear also,, does the fan come on before the gas ignites, if not the circuit board is going bad the fan should start first to omit the gas fumes

Apr 13, 2009 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Bosch Pro tankless water heater overheating


The vent pipe you use is the correct size for the heater.Longer runs require bigger pipe.I also would check to see if the water is getting to hot.

Mar 16, 2009 | Bosch ProTankless GWH 715 ES LP Tankless...

2 Answers

BOSCH TWH-G1-25 not lighting


Model????? The 635Es, 250SX and 2400E are same. The 2400ES and 2700ES are World 2 heaters. Any error codes as I can't imagine this problem w/o codes. Flow initiated but you have spark. Is there any ignition? If so flame rod may be bad and not reporting ignition. Igniter sets on some early 2400/2700 have proved to be bad. Water pressure has zero to do with this. If you have an EC or EA code you have gas problems (meter, line size/length or gas valve). Also if 3005 or 3007 Software you can pull the last 5-10 error codes from Controller.
You need to call Bosch and get an RSA out there. This is a gas appliance that if you screw up can destroy your house. FYI any water in the gas valve condemns it. It will not dry out and work correctly. Is the fan running at ignition and/or purge? Any Controller errors require replacement. You have 2 years on parts warranty from installation date so don't screw around trying to DIY. Warranty Labor is not covered.
Flue obstruction? If you used the AQ3 installation Kit you have the wrong termination box to prevent freeze up and/or water penetration You need the Z-Vent drop nosed termination. Look for a fine tan dust in the fan intake (brown plastic) the intake throat or in passageway to the gas valve. Call Bosch unless you're a Gas Tech this is beyond you.

Mar 02, 2009 | Bosch AquaStar 2400ES-NG

1 Answer

Fan runs continuously


the air pressure which does not controll the fan it is a safe guard for the gas/oil burner to ignite nowing that the fan is running ( air switch normaly negative /positive prssure n/o,n/c circuits. it could be that your boiler is designed for a cant think of techinacal name but when in centre of house/factory and has 1 or more boilers connected to flue etc the fans run when only power to boiler is on , non vented system ? it could be a simple link to remove in controll panel i would phone technical help for manufacture ?

Jan 31, 2009 | Water Heaters

1 Answer

A2 error on Bosch tankless water heater


  1. Check continuity of the flue gas limiter (see Fig. 63, page 46 of manual). Go to steps two and three to determine air box temperature sensor fault and replace it.
  2. Check for flue gas leakage around the top and bottom seals of heat exchanger as well as the viewing window.
  3. Check that venting is within specifications (see Section 3.3 of manual). Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
  4. Check that flue gas limiter connector and spade connections are secure.
  5. Unplug heater and check the two main plug connections inside the control board.

Jan 22, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

Flue vent


Hi CHOA30316,

I'm Harvey the Master Plumber.

Your statement is: Your hot water heater flue does not vent

Please help me to understand.
In order to be helpfull you're going to have to be a little more forthcoming.
Make, model and fuel type?
Direct vent or chimney vented?
Did you just install it or is it old?
If new, is it a direct replacement or is it a little diferent?
A few pictures would also be helpfull if you can.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

Oct 13, 2008 | Water Heaters

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