Question about Rheem EcoSense by 7.4 GPM Tankless Water Heater Natural Gas High Altitude

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Where is the flame sensor? - Rheem EcoSense by 7.4 GPM Tankless Water Heater Natural Gas High Altitude

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It will be close to the fire ring and is a photo electric cell
it registers flame light and cuts off the fuel supply with in seconds if the flame doesn't appear

Posted on Jun 28, 2015

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Posted on Jan 02, 2017

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Why does my bosch 25e ingnite then blows out repeatedly and occasionally stays on if i turn tap on and off and on for abit.


Does the unit have a flame sensor? Check manual. Flame sensors get corroded and need cleaned or replaced. I have had success cleaning them but when you can buy a new flame sensor

Apr 25, 2014 | Bosch Water Heaters

1 Answer

Thermostat Pilot does not light


This unit should be electronic ignition. Multiple issues could be the cause. First check the flame sensor. If those is not the problem then probably a bad control board. Don't know specs on the resistance of the flame sensor. You could try cleaning it with an emery cloth or sandpaper. Do not touch flame sensor with fingers it will ruin it

Jan 05, 2014 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Burner lights and shuts off 3 times and then give warning lights A and B


It depends on the model but AB on most of the AOS the A & B LED's lighting up usually means ignition/flame failure.

Ignition/flame failure:

The gas control valve/thermostat has reached the maximum number of retries (3) for ignition and is currently locked out for one hour. Cycle the power to the water heater off and on to reset.

Basic troubleshooting/solutions:

1 Ensure flame sensor is making good contact with the burner flame and ensure flame is steady. Also ensure supply and manifold gas pressures are within the requirements in the installation manual.

2 Gas supply is turned off - pressure is too low. For low gas pressure, consult with your gas utility.

3 Ensure the flame sensor is clean - use fine steel wool to clean the flame sensor.

4 Check igniter assembly plug and the socket on the bottom of the gas control valve/thermostat for good connection. Replace igniter assembly if the plug is worn or damaged. Replace the gas control valve/thermostat if socket is worn or damaged.

5 Replace igniter assembly.

If this does not apply to your model then here is a link to the instruction manuals for all models:

Residential Gas

Apr 14, 2013 | A.O. Smith 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 gas water heater pilot light will not stay lit


Hi Mike,
1stly you have to understand what the pilot light does!
Yes, it lights the flame, but it protects you from gassing yourself!
that is thye main job!
hava a look inside!
In front of the pilot flame, (it might have a double flame... (one flame on the bottom & another on top.) is a curved piece of metal plate. The flame is supposed to heat that plate untill it it very hot! Thenm the plate bends down as it is a bimetyaalivc strip!
This opens the bsaety valve & you can let go.
The flame will noe stay on. If a gush of wind blows the flame out, the strip will cool & the safety valve close, preventing a dead family in the morning.
There is a newer system as well.
Right in front of the flame, is a pointed sensor with it's tip in the flame. . It has a electric cable running to a safety valve. This sensor have to heat up as well. It is a heat battery that activates the valve. See that it did not move!
If it heats up, & the valve does not keep the pilot flame going after a few seconds, the unit has to be replaced!
Safety first!
Andy

Sep 04, 2011 | Water Heaters

1 Answer

Sometimes it doesn't light at all other times during use the hot water goes off and the box keeps flashing green as it continues to spark


it sounds like the flame sensor is dirty or faulty. when the pilot lights the flame sensor rod recognises the flame to allow the main gas valve to open and ignite the burners. you can clean the flame sensor with some steel wool or sandcloth

Dec 29, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a 2 year old rheem power vent water heater model # 42vp50fw. It suddenly stopped working. It will try to ignite. The igniter will glow and the call for gas will ignite the burner. After a few...


Hi,

The flame sensor is bad....and it is not sensing that the flame has lit....

Some models have a separate flame sensor and some use the ignitor to sense the flame...

If it has a separate sensor then clean it with a soft cloth... if it is the ignitor then the ignitor is bad...

heatman101

Nov 25, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

2 Answers

I have a Rheem Classic Series Super Quiet 80 gas furnace. My problem is the furnace will turn on burner fires for a couple of seconds then burner turns off and fan blows. This cycle cotinues and eventualy...


Sounds like it could be a dirty or bad flame sensor.
When the burner lights ,there is a flame sensor in the flame and it is suppose to sense the flame and send a signal back to the control board which will keep the gas valve open, if it gets dirty or is bad it doesn't send the signal back to the board and the board will shut the gas valve off and after three tries it will lock out the furnace and you have to reset it to get it to work again.
The flame sensor looks like a wire and it's in the flame usually it will get gas deposits on it, then it won't work.
You can clean this sensor with an extra fine piece of steel wool, but before you attempt to do this DISCONNECT ALL POWER TO THE FURNACE.

Dec 29, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

The pilot light will not stay light


The flame sensor is not sensing flame. If it is a thermocouple sensor, they can be purchased for 6 bucks and replaced in 15 min.

Some units have a different type of flame sensor and are a part of the ignitor assembly. In that case, the ignitor assembly would have to be replaced. Those usually run 20 to 60 bucks.

There is a remote possibility that the sensor and pilot flame shroud need to be cleaned, due to rust and other corrosion preventing the flame from properly contacting the sensor. You can try cleaning that first, but chances are you will simply have to replace the sensor.

Oct 11, 2009 | Water Heaters

1 Answer

The pilot light will not stay lit


The flame sensor needs to be replaced.

If it lights, but goes out as soon as you releasse the buttton, the flame sensor is bad.
You will also want to clean the pilot to make sure there is no rust or corrosion deflecting flame from the sensor.

Aug 30, 2009 | Water Heaters

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