1) Copy following link for troubleshoot resources by type of gas control valve, Venting resources, and pro water heater forum:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://www.thetankatwaterheaterrescue.com/forums/forum3/
2) This odor can indicate incomplete combustion due to lack of air supply. Get more fresh air to unit. Check that flame is clear blue color. John Wood is American/AO Smith product so air intake screen is located on bottom of unit. Use mirror and flashlight to inspect. Clean with compressed air ad or feather duster.
3) Jw840nvh is 40 gallon natural gas. Natural gas is lighter than air and rises upward, unlike propane gas that is heavier than air. Install gas detector at height correct for type of gas.
4) For safety, install CO carbon monoxide detector
5) Review product manual for correct vent lengths and diameters.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: Eractic Power Vent Gas Water Heater
Th epproblem you are most likely have is from a safety called a flag switch usually located either in the blower or right past it. When you unplug and replug you reset the switch. Sequence of events.
1 fan comes on.
2 switch is made from the airflow of the fan.
3 ignitor come on
4. main gas valve opens and ignitor starts flame.
You are being stopped at step 2 when the fan does not move with the air. This shuts off and out the water heater from calling again. Find the fan switch and make sure it moves easily. They get dirty and also dry from lack of lube.
Good luck.
SOURCE: Can I Use Existing Venting from Old Water Heater?
Late answer to an old post, but no you can't use the existing vent pipe. The tankless systems require Category III vents along with all the accessories required for your installation. I suggest you use a direct vent model with the concentric vent through the wall. Remove and patch the roof penetrations of the old vent or just abandon and let it remain.
SOURCE: Makes low rumble noise when 2 or more faucets
CALL BOSCH TECH SUPPORT, THE NUMBER IS BEHIND THE COVER, THERE ARE A SERIES OF DIP SWITCHES FOR THIS WATER HEATER THAT HAVE TO BE SET ACCORDING TO YOUR ELEVATION, VENT LENGTH, AND USAGE. THIS IS FIVE MINUTE FIX.
SOURCE: rheem power vent motor doesn't shut off
There could be blockage in your water heaters venting on the outside of the home. It sound like the high limit switch has been tripped. Try unplugging the tank and plugging it back in. this will reset the tank. if the problem persists you will want to call your provider for service.
SOURCE: Rheem Power Vent model
it may be the thermal coupling that is bad for the pilot light. if it goes bad the flame will go out. replace thermal coupling. so if the pilot light is out then it will not heat water. or turn burner on.
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