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Gas water heater turned off after few seconds

I have the same problem with a ARC instant gas water heater. When the faucet get on the heater turn on automatically, but after few seconds its turned off. When was new worked properly, but now i don't know what is wrong. Could be the gas pressure?

Thanks in advance for your assitance.

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  • 52 Answers

Could be but i would say more of a flow problem like it might be restricted

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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Hi my vulcan gas hot water service isn't getting hot enough anymore? please help me?


check first if you have good water flow to and from heater. lift pressure release valve on inlet and allow few sec to flow, same with outlet hot water safety valve.

remove front cover from the heater, you should see your gas connection and thermostat knob.

check if gas is burning evenly and on whole surface, check for leaks on the heater and on the lines to and from the heater.

if you did not find any faults, no leaks, safety valves work correctly, check thermostats settings,

wind it down to minimal, then turn it to about 1/4 value (you did not specify model but this should do, widening arrow or numerical values ar self explanatory), lift hot water safety valve for few seconds, then open any hot water tap (faucet if you are an american...) and check if gas ignites and burns.

set thermostat to about 2/3 value and again, lift hot water safety valve for few seconds, then open any hot water tap. check if gas ignites and if water is sufficiently hot, if too hot - wind it down to say 1/2 way, if too cold, wind it till resistant and then back off a bit, DO NOT EVER LEAVE VALVE OR THERMOSTAT ON MAX!.

if none of these help - you need either, change the thermostat or heater itself.

if works - you solved the problem, close the tap, close the cover and use the system as you normally do.

i am always recommending use of insulation on the hot water system, it saves heaps of money over the life of the system.

hope this will help you - do not forget to vote... :-)

Apr 09, 2015 | Water Water Heaters

Tip

How to troubleshoot and maintain a gas or electric water heater


Water heater problems normally become self-evident: A hot water faucet fails to summon hot water, you see dripping or puddles near the water heater, or the tank emits strange gurgling or popping sounds.
Though many gas utility companies will make a free house call to solve problems with a gas water heater’s burner or the gas supply to the tank, it helps to know how to solve basic outages yourself. For more difficult issues, contact a qualified local hot water heater repair person.
Typical water heater problems include a leaking tank, not enough hot water, water that is too hot, water that is not hot enough, strange noises in the tank, and discolored water. Most water heater problems are easier to diagnose and relatively easy to handle if you understand how they work. For more about this, see How a Storage Water Heater Works. Note: Leaking natural gas can be dangerous. If you smell natural gas (it smells a bit like garlic) near the water heater, shut off the pilot light, close the gas shutoff valve, and call a plumber or your gas utility company for assistance. See our information on gas leaks.
How to Flush & Drain a Water Heater
Before draining and flushing your water heater, turn off the gas or electric power (depending on whether it is a gas or electric water heater) and let the water cool a little. Close the incoming water valve and attach a hose to the drain valve to run the water into a large bucket or to a drain or the outdoors. Open the drain valve and open one hot water faucet somewhere in the house to let in air. When all water has drained from the water heater, turn the cold water valve on and off until the water from the drain runs clear. Then close the drain valve and the hot water faucet, open the cold water valve, and turn the water back on.
Water heater tips
Set the temperature control to about 150 degrees F. or lower if you have no dishwasher or if you have small children or elderly people in the home who might scald themselves. To minimize the energy it takes to heat the water, insulate your water pipes if they run a long way from your heater to your faucets. Also consider installing a point-of-use water heater. Always shut off the power to an electric water heater before working on it. Periodically check the temperature-pressure relief valve, which keeps pressure in the boiler from building up too much. Lift or lower its lever on this valve. Water should drain from the overflow pipe. Do not work on an electric water heater if there is standing water pooled on the floor near the appliance. Shut off the circuit to the water heater and call a qualified water heater repairperson.

on Sep 03, 2010 | Heating & Cooling

3 Answers

Drain hot water heater


turn off gas
turn off cold water to heater
connect hose to spickot
place hose end outside
turn on spickot
open hot water faucets in house
wait.
when water stops, turn on cold water for 30-60 sec or so to try to stir up any sentiment in tank
turn off cold water and let drain.
close spickot
turn on cold water
let fill till water start coming out hot water faucets then turn off hot water faucets.
turn on gas and relight pilot.
finish bleeding air from hot water faucets.
set water heater thermostat

Jun 14, 2014 | Rheem 43VP50E2 50 Gallon FVR Natural Gas...

1 Answer

The heater does not shut off when the faucets are turned off. It is intermittent and after turning the faucet on and off a few times it will eventually shut off. What the solution to fix this problem?


First, add a comment and describe which heater you have: tankless, tank, gas, electric, which brand, approximate age of installation, and what you have done so far.

Next would be to turn off all taps, and put ear on pipe and listen for water leak.

If cold water is running and hot is off, and single-handled faucet has crossover problem, then a water heater will continue to receive incoming water causing waste of energy
http://waterheatertimer.org/Crossover.html

Next would be to review product manual for troubleshoot, and required maintenance.
Next would be to call installer, if installation is new.
Next would be to call manufacturer and ask for name of qualified service technician in area, and check if your product is still under warranty.

If you have tankless computer water heater, and unit is older than 5 years, then imagine how well your 5 year old laptop computer works, and then install tank-type heater to avoid continual maintenance and failures:

http://waterheatertimer.org/How-to-install-gas-water-heater.html

Gene
h

Sep 13, 2013 | Bosch GWH 425 EF L Water Heater

1 Answer

Hi, I have the 1600 NG tankless water heater. Everything works great, but I installed low flow hot faucets throughout the house and now the igniter will not click on. It works for the washing machine. ...


http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#flow
1) Tankless require minimum flow rate before burner will activate.
2) Sounds like the water pressure drops quickly when faucet turns on. This implies combination of problems including sediment build up inside lines, crossover at single-handled faucet, or sediment filter clogged or water softener clogged.
3) Low flow faucets can reduce needed flow rate.
4) Other problems can contribute: sensor failure, loose wires, PC board failure, high temperature setting, cold incoming water temperature during winter months.

Jul 20, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

I have a Bosch 250sx NG I hired a plumber to install. I have 3/4 water and 3/4 gas line to unit. When turned to hot the water is cooking, turned down it is great,,, almost. My water will turn cold for...


Before calling service technician, open following link for Bosch troubleshooting steps.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If you are not getting error code, then problem could be somewhere in plumbing, as you suspect.
For example cross-over on single-handled faucet, or faulty check valve on re-circulation system, or sediment clog at elbow, or varied water-well pressure. Install in-line pressure tank.
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Be sure to read manual for yearly maintenance protocol.
Tankless must be maintained, and cannot be exposed to hardness in water greater than 11 grains, and should be de-limed each year. Expect maintenance, service, and potential repairs and parts for tankless to far exceed expected $1-8 monthly savings. All costs are energy.

All gas tankless brands can be repaired by homeowner for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Apr 22, 2011 | Bosch Water Heaters

3 Answers

Bosch aquastar Aq125-hx does not produce hot water. Pilot is ok. Gas and Flame heat is ok. water pressure is ok. Just no hot water getting to the faucets. Help.


That particular tankless water heater has hydro-generated ignition. In order for it to function, it requires a certain water pressure and velocity. You can try turning on the hot water in two location in your house to see if that gets it started. If it does, try getting a higher flow shower head, or removing the limiters in your faucets.

Jan 07, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

I have this timer hooked up onto my water heater in the garage . I have instant hot water at all times . My gas bill is 5 times higher than my neighbors . Is this what is causing it ? If I unplug it where...


I think you have a grundfos recirculation pump.
This is not a water heater timer.
For illustration of grundfos system, open link below.
http://waterheatertimer.org/Water-heater-recirculation-system.html
Recirculation system is electric, but it also causes gas water heater to run more.
Unplug grundfos for a couple months to see if gas bill goes down. Your system will revert to regular water heater.

Many things can cause high gas bill. Make inventory of gas-consuming appliances: dryer, oven, stove, heater, water heater. Then inventory how often these appliances are used. Each appliance has a label with BTU listed. Add up BTUs of all appliances and compare with BTUs shown on gas bill. Call gas company about how to cut back.
Gas water heaters can become inefficient. So can any gas appliance. Look at flame inside water heater when it turns on. If flame is yellow instead of clear blue, that indicates the water heater is inefficient, and burner needs to be cleaned, or heater needs replacement or maintenance.
Call plumber for assessment and then post a question on the Tank to double check anything plumber says:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

More information about circulation system:
Notice that illustrations show a pump located under the sink.
It sounds like you have same pump located at water heater.
Both types are same thing.
The purpose is to circulate hot water to your faucet so you don't have to wait for hot water when turning faucet ON. Instead, you have to wait for cold water.

The timer located on grundfos dial determines when pump turns ON.
Link above has illustration showing how to set timer pins using your thumb or ink pin or nail file (women know nail files, so I'm relating here).
To set timer, rotate dial until current time lines up with mark. The dial rotates as time passes and has to be reset after power outage.
If dial does not rotate, then timer is broken, but it sounds like pump is still working, and running full time which is wasteful.
Next, move the pins to set on-off times. Move pins inward, the pump is ON. Pins outward, pump is off.
For more exciting reading about the grundfos:
http://waterheatertimer.org/pdf/Grundfos-L-UP-TL-043-install-photos.pdf

Dec 30, 2010 | Taco 265-1 / 563-2 Combination Analog 24...

1 Answer

How long does it take to reheat water when gas bottle runs out and then you switch to new bottle ?


water getting hot should be almost instant... it may take a minute to move the cold out of the pipes.
is your heater ignighting?
if not then you might have a small amount of air in the gas line when you changed the bottle.
you will need to bleed the line...

with the gas turned on, loosen the gas connection to the unit and let the air out until you smell gas.
tighten the connection, snug, do not over tighten.
wait about 5 minutes for the gas to dissipate before attempting to light the unit.
during this time, you can use a little soap water on the connection you loosened to make sure it is not leaking.

now go turn on your faucets, let the water run for a minute and make sure you get hot water.

if no hot water, then you might have something else wrong. you will need to let us know the error code and what the unit is doing

Aug 11, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Code 12 flashes after third faucet is turned on


The gas pipe size that heater has to 3/4 pipe size.If you got anything any smaller than that is won't give enough gas.Check the gas psi at the heater.If it's bottle gas you should 11 psi.and natural gasline you need 5psi.

Mar 09, 2009 | Rinnai Webstone The isolator EXP tankless...

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