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Will not ignite - Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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Check for gas to the unit
ensure igniter is operational
check igniter wiring harness for damage
or have a qualify technician check it

Posted on Aug 10, 2010

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Posted on Jan 02, 2017

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Model # bth199100 low igniter current


Usually requires igniter replacement.
Here is a link to the troubleshooting page - says call service but details possible remedys...
Smith Vertex 100 Power Vent DV Series 120 Instruction Manual Fault And...

Jan 08, 2015 | AO Smith A.o. Smith Bth-199 Commercial...

1 Answer

How to clean igniter on Mode N-0751M-DV


This is a Noritz Tankless.
That whoosh is excess gas being ignited behind the normal lead/lag time for G-Valve opening and igniter on. Might be the Igniter but you'll need a new igniter gasket as if you pull the igniter assembly and clean ONLY WITH A GREEN SCOTCHGUARD PAD, you'll shred the gasket and need a new one. NEVER sandpaper an igniter it is coated and sanding destroys it.
Also may be a flowmeter signal problem where flow is sensed but ignition signal is slow to igniter but on-time to gas valve opening resulting in excessive gas pocketing in HE before a clean ignition.
I'd say Tech Service Issue as this gas can pocket in the extreme enough to blow the unit off the wall with a late or slow ignition spark.

Sep 07, 2014 | Noritz 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 Bradford White Defender M-I-30T6FBN doesn't show igniter button on instructions


1) Copy following links to identify gas control valve and read ignition procedure, and access service manual for your product:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

2) Honeywell gas control used on recent Bradford White gas water heaters has red knob that rotates to pilot. Press and hold red knob. Then push red igniter button until status light changes.

Feb 11, 2013 | Bradford White Bradford MI30T6FBN-337 30...

1 Answer

Igniter is not working


Try removing the igniter. (First turn the heater off) There is a heat sensor rod on the igniter. If it is blackened use fine sand paper or a scotch brite pad and clean it so it is shiney. reinstall the igniter (turn the heater back on) and try it. If that doesn't work the igniter may be defective and will require replacement. I have a smaller A.O. Smith water heater and that little trick has saved me three service calls. Good luck.

Nov 20, 2012 | A.O. Smith BTH-199 BTH-199 100 Gallon...

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

I have a G6A-7E electronic ignite water heater.


Make sure propane is on and getting to your stove burners ok, first, then try switching it back on. If it fails to ignite, shut switch off and try a couple of times, if still no ignition, get back to me.

May 24, 2010 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

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

Oct 27, 2009 | Bosch Water Heaters

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