Question about Teledyne Laars Laars Lite 2 Pool Heater 250,000 Btu / Natural Gas

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Continuity in heat circuit / new thermopile. heater won,t fire. how do i test/ jump out the heat circut on the gas valve. test the board etc.. thanks

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  • btandpt Jul 04, 2009

    THERE IS NO 12V THIS IS A LAARS MILLIVOLT SYS

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Here are a few things to check: Does the pilot light stay on after you light it? If so, good, did you turn the control valve to the "on" position? Sounds funny but there's a pilot position and a "on" position. Is the pump on? Water must be circulating through the heater to activate a pressure switch & then the burner will come on. If not find the manual on position for your pump timer to start the pump. Burner still doesn't come on? Check the burner assembly for plugged orifices (i.e. spiders, corrosion, etc.)and clean it out

here is laars installation manual

shop.solardirect.com/.../pool-heaters/...pool-heaters/jandy-lite2manual.pdf

back with result

Posted on Jul 04, 2009

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This water heater relies on a circuit board that provides a spark to light the flame when the switch is placed to the on position. Electrodes sense the flame within six to eight seconds, if the signal is not found the circuit board will shut down the gas valve and the system goes into safety lockout. There is a thermal shutoff that should trip when the temp rises above 190F. This fuse is located on the incoming power wire connected to the thermostat, you should see this under the exterior cover, the ones I have seen have clear plastic on the wire, once they trip they need to be replaced. AT this point I would pull the cover off the exterior, check all the 12 volt wiring make sure there is no corrosion. I would suspect the thermal shut off is bad. IF you have a volt meter you can check for continuity through the fuse. I ran into this not long ago and with this fuse not working it caused the water heater not to fire.
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Kevin

Posted on Jul 04, 2009

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Need some help. I rebuilt my old wall heater and it won't turn on. New thermopile, pilot and gas valve. The pilot works, but burner won't ignite. New thermostat too.


turn thermostat to off position check wires from thermopile to stat and gas valve for damage etc . Thermopile has to warm up and make 600 mille volts to work . Try this then open stat and see if it fires up .

Dec 05, 2016 | Heating & Cooling

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Just replaced thermopile generator and pilot will not stay lit


Check the new thermopile with a millivolt meter and make sure it has the correct output not connected to the gas valve.If it does,then the gas valve is defective.Make sure to test ONLY the thermopile.If it does not generate enough millivolts the gas valve will not open.If the piliot is dirty it will not generate enough heat for the thermopile.Make sure you have a good,strong,blue flame at the pilot.You said the piliot will not stay lit?If not then start by blowing air back through the piliot where the flame comes out with compressed air.hopefully that will clean it well enough.If not you may have to take the pilot tubing loose from the valve and use compressed air to clean it.Make sure when you reconnect the tubing to the valve USE FINGERS ONLY to start tyubing or you may crossthread the tubing....and thats NOT a good thing.Good Luck.

Jan 16, 2015 | Williams Wall Heaters: 35,000 Btu/hr...

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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...

1 Answer

Is the honeywell wv8840B1109 like a smart meter. I was concerned after they installed this on my new water heater. It's basically an alarm for if the pilot shuts off. Seems awfully big to just be for that....


Thanks for photo link. Not a smart meter.
Just ordinary water heater gas control valve, with small circuit board to support error codes:
Copy following link for handy resources:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://www.thetankatwaterheaterrescue.com/forums/forum3/
http://waterheatertimer.org/How-to-replace-Honeywell-gas-control-valve.html
How the newer gas control valves are different: Old water heater had thermocouple which supplies very tiny current to gas control valve. When pilot light blows out, the thermocouple no longer sends tiny current and gas control valve shuts off gas to heater.
New gas water heaters have thermopile (just like modern furnaces and stoves), which is basically several thermocouples bunched together. So thermopile sends more current to gas control valve, and supplies enough current to power small circuit board. The circuit board records error events and issues simple error codes. If pilot blows out, then thermopile no longer sends current and gas control valve shuts off gas to heater.
Moreover, the new gas control valve can be repaired and replaced without removing from tank. So tank does not have to be drained... saving time and repair cost.
Gene

Aug 09, 2013 | Water Heaters

1 Answer

Hi, I have a pentair minimax 250 pool heater and the burners will not stay lit. The pilot stays lit but burners will not kick in. I have it jumpered on the gas valve to heat the pool but I feel very...


first of all dont jumper the gas valve! if the pilot stayson and the burners wont fire there a a few reasons for that. one of your safeties are open.....malfunctioning potentiometer ( tstat control)......or theres a short or voltage drop through the circuit. ur pilot generator should have around 400 dc millivolts. if you follow the path in the circuit and anything drops to the 200dc mark then theres a problem. make sure ur electrical connectors are tight. millivolt models are garbage, as it takes very little to interupt the circuit

Jun 20, 2013 | Heating & Cooling

1 Answer

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

2 Answers

Pilot won't stay lit on mr heater vent-free propane heater


if it is direct vent chances are it has electronic pilot.. it does not have a standing pilo and match size upt. if in fact it did have a buning pilot there is a part called thermocoupling. it will look like a 1/8 in. copper wire coming out of the bottom of the gas valve and goes right to the pilot. anywhere from 10 in. to 20in.. unscreew nut at gas valve pull out from pilot area [ it just clips in at pilot] take it to any home center

Nov 25, 2012 | Kitchen Ranges

1 Answer

Is a thermapile the same as a thermacoupler


no thermocoupler is a safety device if the pilot goes out the thermocouple cools and the valve closes shutting off the gas .

thermopile makes the currant that opens the gas valve when thermostat calls for heat , ie on fire places

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5 Answers

How do you check a thermopile? MY pilot is on but it wont light. I checked the manifold and its all cleared. Thinking its my thermoplie not telling the switch to open.


A thermcouple is what keeps pilot on, if your unit has both a thermocouple and thermopile then your pilot CAN stay lit and main burner not come on.do not buy a gas vavle untill you check the thermopile voltage!! very costy blunder.this is how you test it..( open circuit test) Disconnect thermopile leads from valve. take a volt meter set it to millivolts- set it to a mv reading above 500 so that you can test it correctly, my meter has 2000 setting and I use that. connect T/P leads to meter leads.. reading should be 500mv.
( closed circuit test) connect leads of meter to terminals that your thermostat or on/off swich are hooked too, usually top and bottom terminals on most gas valves, turn unit on and reading should be 150mv or more... you need try open circuit. I can test your vavle too if you like keep me posted if I helped or not. 15 yrs experience in gas repairs!!

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