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Gas not getting to the combustion chamber of water heater

Gas in system but will not flow into combustion chamber or the igniter

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  • Water Heaters Master
  • 5,245 Answers

1) Gas control valve might be bad.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

2) Copy following link to identify gas control valve:http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
3) Link above has general troubleshoot information concerning each gas control.
4) If FV system tripped due to clogged air intake, then can shut down gas control.
http://waterheatertimer.org/How-to-repair-Rheem-FVIR.html

Less air means slowed venting, but same amount of gas is still burning, which overheats combustion chamber tripping FV system.
Each brand is different: Some air intakes are located on bottom of heater, while other brands, the air intake is located under combustion chamber.


5) Gas control will also fail if thermostat fails and allows tank temperature to reach beyond ECO set point. The ECO is 1-time-use thermal fuse. Replace gas control.

Posted on Dec 06, 2012

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SOURCE: Water heater with electonic igniter will not work in power outage

What type of heater is this? I need to know the model name and make and then we can go threw the process of how to do it. Most gas heaters do not have power to them and I only know of a few tankless heaters that do.

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kevin000
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SOURCE: Bosch tankless GWH 1600 H NG won't always ignite

The manual says to hold a match near the pilot while the ignitor is trying. It says that if the unit lights the pilot orifice may be dirty or clogged. Then the manual says to check the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.

Let me know the status ...Kevin

Posted on Mar 29, 2009

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SOURCE: bosch 25e water heater wont ignite

combi or standard if combi pressure too high and will be blowing off your high pressure release valve which would stop your boiler from igniting best of luck

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SOURCE: the electronic ignition on a gas water heater will

You won't see any red glow until the burner ignites and burns for a while. Its only an ignitor and flame sensor, not a glow plug style.The ignitor has to provide spark for gas to ignite, then it also senses the flame and keeps gas flow coming. What exactly is happening when you turn it to on?

Posted on Jul 20, 2010

  • 1 Answer

SOURCE: Error code 13 (air flow) tankless H20 Rheem

I have the RTG-53DVN, it too is an overly sensitive peice of ****. It worked for about 2 years, then started throwing errors. Had a plumber come out to look at it. He spent a lot of time on the phone on hold with Rheem, then they finally just overnighted a new circuit board. Well, that worked for about 3 weeks and now I have a brand new error code. What a peice of dung. Save yourself the frustration and do not buy a rheem.

Posted on Oct 17, 2010

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How to test flammable vapor sensor lockout on whirlpool gas water heatermodel nd50t122-403


You could clog up the screen on bottom of water heater... and this would cause FV system to trip because of overheated combustion chamber... then clean arrestor screen and push reset button located on front of combustion chamber to get water heater working. Of course you might have to replace parts to restore functionality.
Or pour some gasoline nearby and see if the water heater explodes, or if the FV trips. I would think this to be unwise.
Contact Whirlpool
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

Gene

Oct 19, 2014 | Water Heaters

1 Answer

Self igniting hot water heater won't reset.


Today's water heaters have sealed combustion chamber and piezo igniter.
If igniter is bad, then water heater will not light... replace igniter.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#pilot
http://waterheatertimer.org/How-to-light-gas-water-heater.html

Gene h

Mar 31, 2014 | Water Heaters

1 Answer

On A.O. Smith water heater model BTH 199 100 where is the heat sensor rod located ?


Parts list:
http://www.hotwater.com/lit/partslists/197728-004.pdf
Flame rod, flame sensor sits next to igniter inside combustion chamber. This can be cleaned with sandpaper. Do not touch with fingers. Purpose of flame rod is to detect whether ignition has caused actual, sustainable fire inside the combustion chamber.
If sensor is bad, or no ignition is detected after 2-3 attempts, then 'no ignition' error is given.
Bad gas control valve, bad-or-dirty flame rod-sensor, low gas pressure, misaligned rod, dirty combustion parts, etc

Service handbook:
http://www.hotwater.com/lit/training/316586.pdf
High gas pressure spikes can daMAGE gas control valve p7

Product manual:
http://www.hotwater.com/lit/im/com_gas/197727.pdf
Word-search for 'failure'
Low gas pressure. p14 and p54
1-3 trials before declaring 'ignition failure. p48
bad flame sensor (clean with sandpaper) #10 p58
unit must be grounded (check outlet with circuit analyzer) #12 p58
Sequence flow chart p59
Rough starts = ignition failure p60
Troubleshoot chart - ignition failure p62

Mar 12, 2013 | A.O. Smith BTH-199 BTH-199 100 Gallon...

1 Answer

My 50 gal lp water heater made a slight boom sound and now when i lite it and turn on the main bunner it snuffs its self out


1) Call manufacturer with model number and serial number appearing on label on side of water heater.
http://waterheatertimer.org/Water-heater-manufacturers.html

2) Copy following link to troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-to-replace-thermocouple.html

3) Product manuals today recommend yearly service, and yearly cleaning of combustion parts, and to keep air intake clean.
If air intake becomes clogged, or combustion parts get dirty, it can slow the exit of combustion gasses, and this will soot the burner, and clog burner ports, which means slow lazy yellow flame and incomplete burning of released gas. So unburned gas is present in combustion chamber and up the flueway. The ignition of unburned gas can cause explosion of various intensity ... and the 'boom' sound you heard.

The explosion certainly overheated combustion chamber and tripped FVIR system.

4) Since each manufacturer has different FV system (flammable vapor ignition retardation system), and each manufacturer has continued to make changes over time in FV systems, the solution for tripped FV will vary by brand and age and model of water heater.
For example the intellivent gas control can be reset in some models, while other models require replacement of parts ranging from gas control valve to FV sensor to glass vial, and include possibly full replacement of water heater.

Jan 20, 2013 | Water Heaters

1 Answer

What should the gas pressure be on pilot?


Copy following link to troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Bradford White posts service manuals: Both before and after introduction of ICON (Honeywell) gas control valve
http://www.bradfordwhite.com/documentation/residential/gas.asp

Don't forget to clean air intake locate under combustion parts, using instructions in service manual. Or compressed air. Ample air supply will ensure that combustion chamber does not overheat because of slowed venting of hot combustion by-product that will trip the FV system.
And remove heat trap inserts if water pressure has problem or water heater is humming or whistling

Post question on pro water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Nov 28, 2012 | Bradford White MI40T6FSX 40 gallon LP gas...

1 Answer

Hot water heater womt light, flammable vapor sensor code


Most likely: Combustion chamber got too hot because air intake is clogged with dust, causing less air to flow upward through vent pipe ... the slowed flow of air caused combustion chamber to overheat.

What brand and model water heater?
Look at label on side of unit and add comment.
Otherwise call service tech to repair/ replace water heater and clean arrestor screen (air intake) and replace or reset parts as needed, depending on model number and brand water heater.

AO Smith, Bradford white, and Rheem are main manufacturers.
Each has slightly different repair protocol, and each gas control valve can also be different. So more information is needed.

Identify gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
Rheem TRD/ FVIR glass vial
http://waterheatertimer.org/How-to-repair-Rheem-FVIR.html
How to remove combustion parts to inspect for Rheem glass vial and clean arrestor screen located under combustion chamber:
http://waterheatertimer.org/How-to-replace-thermocouple.html

Sep 30, 2012 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

Rheem water heater 42vp40sf and the fvd interface failure code is flashing. how do i fix this?


Call Rheem
1-800-432-8373

TRD is flammable vapor system. Typically there is a glass bulb or fuse located in the combustion chamber.
See example image:
http://waterheatertimer.org/images/FV-TRD-glass-fuse-300.jpg

Remove the burner and look for the evidence of broken glass bulb that holds the air intake open.
Air intake is located bottom of combustion chamber, and bulb breaks causing metal plate to snap upwards and close off air supply to combustion chamber.
Rheem will have exact part number and possible instructions. Other people have wedged the air intake open to get system working again, but I do not know if that will work with your model water heater with electronic control. Working around the FV system exposes home and people to flammable vapor ignition and explosion when water heater is exposed to flammable vapors.
Example manual with illustrations.
http://waterheatertimer.org/pdf/Test-if-thermal-release-device-needs-replacement.pdf

Clean burner and pilot orifice and combustion chamber while burner parts are removed. Also clean air intake.
When burner is removed for cleaning, the access door gasket might need to be replaced.
Your product manual and/or Rheem will have that part number.

Sep 23, 2011 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

Cannot find pilot light on my bosch GWH635ESL, help!


Call Bosch
Gas Products Technical Support: 800-642-3111

That model number is only shown at one website, and that model number is not shown at Bosch.
Open following link for Bosch:
http://www.boschwaterheater.com/BoschHotWatercomHome/GasProducts/tabid/331/Default.aspx
Search of Bosch for that model number shows no result.

Some water heaters do not have a pilot light. Instead they use hot surface igniter rod that glows red hot
The igniter rod ignites the gas after solenoid valve opens and gas flows to combustion chamber.
The igniter rod and heat sensor have to be operational, and have to be positioned correctly for ignition to take place.
If igniter rod is not working, or if heat sensor does not detect flame, then gas solenoid valve shuts down and water heater does not heat water.

Sep 03, 2011 | Bosch Water Heaters AquaStar - Tankless...

1 Answer

Automatic restart is not working. Seems to keep saying eco problem...I thinl...the code is four flashes followed by two flashes.


Gas control valve is not identified, so error code is not known.
ECO means energy cut off.
Energy cut off happens when gas control valve thermostat has gone bad, or when gas control senses runaway heating inside combustion chamber.
Newer heaters have resettable ECO for combustion overheat. This reset is typically located on combustion chamber door and is round and has two wires that connect back to gas control. Generally you have to clean combustion chamber and tubes and catch up on maintenance, then reset ECO, then fire up heater again to see if problem is resolved.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/images/Typical-gas-valve-500.jpg

Newer heater does not have reset for bad thermostat, and in that case you replace gas control valve thermostat.
Older heater does not have reset, and combustion chamber and parts are cleaned, and gas control valve thermostat is replaced.
Your manual is best place to start troubleshoot.
Open following link to help identify gas control valve:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Jul 10, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

We have a 10 year old Rheem PVW50 Power Vented water heater that works on gas. The last couple of days it has been giving out problems. It will not maintain hot water in the tank. I restarted it and...


The igniter is glowing, but no gas ignites?
So either the gas is entering combustion chamber and not lighting because igniter is positioned incorrectly -or- no gas is entering combustion chamber because air in gas line or bad gas control valve thermostat or gas line is clogged.
When you 'restart' the water heater, somehow you are getting gas to the burner and it is igniting.
I'm not sure what the flame switch is. If the ECO was cut out, the gas control valve would not send power to the igniter and there would be no gas available for 'restart.'
I would adjust location of igniter, check if gas is entering combustion chamber, clean the gas line to the burner, and bleed gas line for air, but another suspect could be the gas control valve thermostat.
Identifying numbers are usually on side of gas valve.
Open following link to help identify gas valve:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#intelli
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

Jul 02, 2011 | Rheem Water Heaters

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