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Responded to service call. no hot water. code shows pressure switch not closing within five seconds of vent motor running. checked with manometer for proper vacuum for switch it was -.85, the pressure switch only requires -.75. checked tubing for cracks or blockages, none. jumped out pressure switch and limit to see if burner would light, it would not and continued to show same code. removed jumpers from safeties. Wondering what else could be the problem. is it possible the gas control is not reading the voltage from the safeties? it appears from looking at the wiring diagram that there is no other safeties in series before going to the control valve. this is a giant power vented 50 gal how water tank

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Takagi t-k3 runs hot on low to med flow on high turns cold & flame shuts off


OMG 95 PSI is too high a pressure for a tankless! What was the W.C. in inches on the manometer?
Also on a T-K3 12 isn't a Code but a partial Code. You need an R/C to make this easier as counting led flashes produces wrong codes.
you'll have to find the correct code it's throwing not a partial.
And put a Pressure Reducer on this to below 60 PSI. 95 PSI is only impressive when it blows the tubing out after a few years.
Call Takagi in California not A.O. Smith in TN and they'll help someone fix this

Sep 20, 2014 | RTO Takagi T-K3 Flash Gas Tankless Water...

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Bradford White gas power vent water heater; just replaced power vent motor and fan assembly because a bearing went out. Now the new fan motor runs constantly without igniting. Is there a switch that...


Some how you have disconnected the sensor that tells the main burner that the fan is on. Its trying to light but cant. On some models there is a air pressure switch that reads the pressure inside the vent pipe itself. It will have a small hose on it and if that has cracked or was not replaced it wont light. This is how its supposed to work--- vent fan comes on,sensor confirms fan is on,hot surface ignighter starts to glow red,and main burner is opened,another sensor confirms that main burner is lit,then hot surface ignighter turns off. Hope this helps.

Jan 11, 2013 | Water Heaters

1 Answer

Rheen PVW50 Hot Water Heater Making Buzzing Noise and Doesn't Light


Why is it always Rheem problems?
Every water heater problem is Rheem.
And Rheem doesn't post any service manuals, like the other two big manufacturers, AO Smith-American, and Bradford White.

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

Scroll up and find pressure switch heading among links.

You can install gas control valve yourself.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

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1 Answer

My Honeywell Water Heater Thermostat will turn on for 30 seconds. Then it shuts down- wait 5 seconds turn it off EITHER with the ON/OFF switch OR by turning thermostat to off & back on immediately! If...


Time to call qualified service technician. And watch what that person does to learn about your water heater.
I assume you have Honeywell Icon gas valve. Honeywell makes different several model numbers.

Here is 'typical' Honeywell Icon gas valve service manual for Bradford White, that may or may not apply to your water heater. It shows testing for Icon and disassembly instructions, and error codes.
http://waterheatertimer.org/pdf/Bradford-white-service-manual-44943-D.pdf

Gas water heaters today require yearly service that includes cleaning burner parts and combustion chamber, checking vent and air intake, electrical connections, testing gas valve, checking gas pressure, bleeding air out of gas line, etc. These are things you can learn to do by reading service manual, and making sure you have a spare water heater around to connect real quick if experiment goes wrong.
If Icon gas valve is problem, that control is modular and can be replaced without draining tank.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

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1 Answer

Every time it rains our instantanious hot water system comes up with error C9 and C12


Before calling service technician, open following link for Rheem troubleshooting resources including contact and chat and typical manuals:
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are start points for troubleshooting and can include long list of things including multiple causes.
Error code 12 shows 'condensation collar' and 'vent lengths' which are associated with the vent to outdoors. Changes in air pressure during low-pressure rain events MIGHT affect the venting and cause tankless not to ignite, and MIGHT cause excessive condensation. Improper condensation can rust out the heat exchanger without showing any signs of problem until the unit is ruined.
C9 is not listed. Contact Rheem, and then add a comment saying what Rheem suggests as solution for C9 error. This will help others in the community with same-similar problem.

Instruction manual recommends yearly maintenance by qualified service technician.
This maintenance would usually check all things shown in error 12.

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1 Answer

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http://www.digelair.net/pdfs/TECHLIT/BOSCH/MANUALS/Bosch-ProTankless_AM.pdf
http://www.bosch-climate.us/files/201009031238250.GWH715ES_English_12.2008.pdf

Above are the manuals required to diagnose and service your error code.

EA: No flame ionization detected with water flow.
Verify that all manual gas shut off valves are open. Check gas type. Reset error code and open a water tap to cycle the heater in an effort to purge air on new installations. Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater. Check three wire connections to ignition group on the lower front of the heat exchanger are secure. Check gas pressure. Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod. Check that the minimum power fan speed has been adjusted to the proper value. Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If flame is unstable or yellow with proper gas pressure.

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1 Answer

I have a model 6G40PVW-40F water heater and we have no hot water... the thermostat light on warm/vacation is on and so are 2 other lights...If I diconnect it and re-connect it then it will start..the gas...


Most gas water heater problems today can be solved with yearly maintenance that includes cleaning burner parts, clean air intake, check venting, check electrical connections, bleed gas line, and check gas pressure.
Gas water heater manuals recommend yearly maintenance by service technician.

In past years, gas water heaters required less maintenance, but they were less energy efficient and more dangerous to operate.

Sounds like you have Intellivent gas control valve thermostat.
Open following link to identify gas valve and see error codes:
http://waterheatertimer.org/pdf/Intelli-vent-gas-valve2.pdf
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#intelli

Error light on vacation + 2 other lights = 3 possible conditions:
1) Wiring error: check outlet with circuit analyzer:
http://waterheatertimer.org/images/Typical-circuit-analyzer-15.jpg
2) Pressure switch tubing not connected, air intake obstructed (clean intake), or vent exhaust obstructed (check for proper venting).
http://waterheatertimer.org/images/Test-water-heater-vent-400.jpg
3) System in lockout: Low gas pressure, hot surface igniter not positioned correctly.

You can do some of this yourself.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

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1 Answer

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I see your question posted under JJ, and will also watch for the answer.
The Tank has amazing amount of water heater information. But the industry is also changing very fast.

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1 Answer

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Sorry to read about your problem, I hope this helps you out.

your WC pressure is fine it needs 3 and you have 5, can handle 8
The gas company adjust at meter, you have other issues

Check gas solenoid valves for open or short circuits.
Ensure igniter is operational.
Check igniter wiring harness for damage.

THIS IS A GAS PRODUCT, INCORRECT REPAIR CAN CAUSE A EXPLOSION, AND DEATH CAN OCCUR. IF YOU DO HAVE THE PROPER TOOLS SUCH AS MANOMETER AND LEAK DETECTORS, I SUGGEST YOU CONTACT A SERVICE COMPANY

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1 Answer

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