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Heater goes on for 5 minutes ,then shuts off,just changed thermopile generater,changed fusible link 2 months ago and now its burned again, read it might be flame rollout,there is alot of soot,what do i do help ITS A MINIMAX 100 MILLIVOLT MODEL NATURAL GAS

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Clean the burners the gas is coming out side the heater check if all the burners are on if all are ok hat exchanger need to be clean very hard need to take out from the heater and re install make sure you mark all wires(use the stuf to clean the ovens rise with LOW pressure do not bend the tubes )

Posted on Sep 13, 2009

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Outlet water gets so hot it ballooned the PVC pipe like an anuresum. Lights and shuts down, assuming that is a limit switch working properly. Filters cleaned last month/water pressure seems adequate.


Your thermopile that tells the heater how hot the water is has failed. It should kill the heat at a temperature of 104f. This also indicates that the limits are not doing their job, as they should be killing the heat at 135f (low limit) or 150f (high limit). Schedule 40 pvc is rated at about 140f.
This many failures at once is rare, and typically indicates that the heater has been rigged. Get a tech out to fix it correctly. You are literally playing with fire.

Nov 28, 2013 | Hayward H Series Pool & Spa Heater 400k...

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I bought a brand new house and the gas water heater seems to be stuck in vacation mode.


Copy following link to troubleshoot by type of gas control valve, instructions how-to-light-water-heater, including error codes etc:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
To reset the intellivent gas control, press and hold both arrow buttons for about 5 seconds
This water heater requires pilot flame. Look through site glass and upward (or use mirror) to see if pilot is ON and burning clear blue flame and not lazy yellow flame.
Check that gas shut-off is parallel to gas line:
http://waterheatertimer.org/images/Gas-water-heater-89-valve-2.jpg
Check if outlet has 120Volt, and that polarity of outlet is correct. Power vent water heaters require correct polarity: use circuit analyzer. Check if there is ground continuity between ground and manifold tube (center tube that connects between burner and gas control valve).
Scroll to top of same link to read about FV system and air intake cleaning. Must have good supply of incoming air.
Same page half way down has troubleshoot section for pressure switch testing, blower troubleshoot etc. The pressure switch and blower communicate electrically with gas control thermostat to determine when to release gas to burner where pilot ignites gas, causing poisonous combustion by-product to vent outdoors and help nature.
This model has thermopile instead of thermocouple. Basically thermopile is several thermocouples. When heated, thermopile generates enough current to run small electronic circuit inside gas control valve. This circuitry is very common in hvac units but fairly recent to water heaters. Advantage is error code troubleshoot and more optional controls, for example future response to in-home zwave remote controls and home automation
Get model number and brand from label on side of tank and post question on pro water heater forum with list of what you have tried so far.
http://www.thetankatwaterheaterrescue.com/forums/forum3/
Call plumber to bleed air out of gas line and check gas pressure.

May 28, 2013 | Water Heaters

1 Answer

Wall heater will not turn on


PILOT MY BE BLOWING OUT. IF YOUR WALL HEATER IS NEAR FRONT DOOR IT MY BLOW OUT. ALSO IF YOU HAVE A WEAK THERMOPLE IN PILOT IT WIIL SHUT OFF PILOT. WE USE MILIVOLT VOLTAGE METER TO CHECK WHAT THERMOPILE VOLTAGE IS. IT SHOULD READ 250 MILIVOLTS .CHECK THE LIMIT SWITCH MOUNTED IN TOP FLUE INLET IT SHOULD BE CLOSED AT THE 2 SPADE TERMINALS. CHECK ALL SCREW TERMINALS THAT THEY ARE TIGHT. HOME DEPOT MIGHT HAVE THERMOPILE FOR WALL HEATER

Apr 19, 2010 | Williams (5009622) Ceramic Gas Wall...

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Patio propane heater shuts off after 15 minutes


Before you go changing parts, clean up the pilot assembly. When you heat metal and let it cool and heat it again it causes it to corrode. Also for some reason these areas seem to attract little spiders who make their homes here. This causes gas flow problems which in turn could affect the size and direction the pilot flame. For if it does not touch the thermocouple, thermopile or whatever that little thingy is called that tells the gas valve to allow the gas to flow...it will not tell the gas valvle to let it flow. Remove the corrosion, spiders, spider webs and any other insects then sand the thermocouple, thermopile or whatever that little thingy is with a rough sandpaper to remove corrosion. It will likely work after that.

I am very familiar with this heater, unfortunately. I posted the instructions on another problem with this same type heater to take it apart, clean and service it. That should be helpful.

Mar 08, 2010 | Uniflame 200209 Open Flame Patio Heater

2 Answers

Laars Lite 2 Gas-Pilot stays on, but main burner shuts off 10 min


A polit generator produces about 750 MV without a load. Under load it will drop to about 200-250 MV. If the system is working don't worry about it. If the system is not working replace the pilot generator and retest. Pilot generators usually go bad slowly.

Jun 22, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Main burner will not light. pilot has now gone out


shut off the gas at the gas **** and gas valve. the pilot tube is held in place by a 7/16 compression nut. remove it then remove the 2 screws for the thermopile "generator". follow the pilot tube and the pilot assembly should be held in by one or two screws. usually you don't have to remove the main burners. hopefully this helps

Jun 14, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Heater won't light. Pilot on and good flow.


depending on how old the unit is it may have a thermopile "generator". the thermopile will have 2 wire leads that usualy attach to the main gas valve by 2 screws. set your multimeter to mvdc and tke a reading usualy anything over 350 mvdc will be able to energize the gas valve. any bad connections or open limits or safty switches will not alow the main gas valve to energize. hope this helps.

Jun 14, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

I have the exact same problem


I've had the problem twice. The company told me 500mv on the pilot generator was too low. 3 years ago I replaced the pilot generator and that seemed to fix it. This year same thing, 500mv on the pilot generator, I replaced again and this time didn't fix it and was still 500mv. After poking into everything, here's what I conclude:
- 500mv on the pilot generator is fine, maybe even less.
- you can check the valve and the amount of current the pilot generator provides by clipping a wire from the white to the black on the valve. If this forces the burner on your pilot gen is strong enough and the valve works. Be careful running it this way though, because it bypasses all the safety devices.
- Then check the safety switches and wires. I used an ohmmeter and started working my way from the valve through the fusible link, pressure switch, etc. With that method I found high resistance in a wire from the fusible link when I jiggled the wire. I bypassed just the link, and it's working fine. I've also gone through several pressure switches over the years and a control module as well.
- Everything fails in this heater. It's just a tough environment. the wires and connectors corrode. I live in the northeast, and now in the winter I take out the burner, control module, and thermostat/switch module and wrap a tarp over it. I guess next year I'll pull out the fusible link too, or maybe just solder the connections.

Jun 03, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

2 Answers

PILOT LIGHTING BUT CANNOT TURN ON WITOUT IT GOING OUT


change the gas valve, if the thermocoupling works and the piliot stays lit then it has to be the gas valve check to make sure the screen is clear also,, you said it's propane, check to make sure it is all the way turned on, and has the right pressure it might have a bad regulator on it, but will let other things in the house run good luck

Feb 25, 2009 | Bosch 1600H-LP Liquid Propane AquaStar...

1 Answer

Millivolt Generator burnout


I would check the pilot orfice to make sure you have enough of a flame to heat up the generator. You can buy a orfice drill bit and drill it out one size. The pilot should hit the generator toward the center. You should be able to buy a new orfice for the pilot assembly from the place you bought your heater.

Apr 10, 2008 | Cozy Enclosed Front Console Heater 20,000...

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