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How do i bypass the EBS valve relay on my 05 MV F4 1000S

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I need to trobleshoot the pilot generator for a Laars pool heater model lg125n

First, check to ensure that the pilot generator is fully bathed in the pilot flame. If it is not, that must be corrected first. Once the generator is fully bathed, it should put out at least 500 millivolts. New generators will easily exceed this level, but you want to see at least 500 mV. I have personally seen heaters continue to work properly with mV outputs as low as 400 mV, but spec calls for at least 500. If you are not getting 500 mV minimum, replace the pilot generator.
Testing the gas valve itself involves jumpering the valve such that the 500 mV from the pilot generator goes straight to the valve coil, bypassing all the components such as thermostat, high limits, pressure switch, etc. I generally recommend that homeowners avoid playing with the valve if they are not trained to work on gas appliances. It is one thing for a homeowner to do the simple repairs, like changing a pilot generator (which is a piece of cake for someone with even moderate skills). It is a completely different matter to play around with the valve if you don't really know what you are doing.
As a final point, unless the heater has some age to it, most millivolt gas heaters will have more issues in the components than in the valve or pilot generator. Even the pilot orifice is more likely to be a problem. I'm not saying that you don't have an issue with the valve or generator. I'm just saying they are less likely to be the problem and are always the last items I check on these heaters.

Jul 03, 2011 | Kitchen Ranges

1 Answer

Iam working on a reznor 200e comercial heater. the pilot light lights but the main valve fails to open and the module times out, error code 2 (retry). if i remove the mv wire and jumper off the pv lead mv...

Have you checked to make sure that the new module is passing voltage to the MV terminal on the gas valve? I have seen the solder joint loosen on these things and intermittedly pass voltage. Could also be the relay in the module. Your meter will tell you which it is.

Feb 05, 2011 | Heating & Cooling

1 Answer

I have a laars lite 2 manual controls natural gas. The unit starts up runs strong for 5 mins shuts down restarts runs for now only seconds and shuts off

sounds like the hi limit switch is shutting it down,because it is not getting enough water,cloged filter, valve to heater notopen,bypass valve not closed,open up the water releif valve with the pump running should be alot of water running coming out of it.

Jun 13, 2010 | Lite On Laars Lite 2 Heaters: 250,000BTU...

2 Answers

Pilot lights but no full burner. thermopile ok any ideas

If thermopile generates 700mv...the stat is ok and no open limit then it is bad valve...touch the 2 thermopile leads direct t TH and PP on valve to bypass limit and stat...if it works direct...then a limit or stat is open

May 11, 2010 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Setup vms dcps print queue for a xerox phaser 8500 -can't do pcl

Can you update this with the VMS version please.


Mar 30, 2010 | HP Computers & Internet

1 Answer

Dayton Heater M/N 3E227E

Hard to believe they sell a retrofit kit for a Gas furnace to a Customer....This is ahrd to advise you on with out seeing the schematic and if it is indeed intended for that furnace....the Spark mounting location is CRITICAL for safety so make sure that is correct above all.....OK The wire coming off the transformer and tied to the red wire going to the heat excghanger would most likely be a High Limit switch...cuts the gas off if the blower doesnt work etc or you would have a this switch must be in series with the transformer to cut power when the switch opens....the wire MV/PV coming from the "Electronic control box" needs to go to the New Gas Valve you should have which will have a termional marked MV/PV (Main valve/Pilot/valve) as your old one was for a standing pilot application and when you have electronic ignition you req a Gas valve for Intermittent pilot should also have 2 more terminals on the valve MV and PV which will have seperate lines from the ignition control as well....basicvally there will be another wire coming from MV/PV going back to the transformer...make sure all wiring is correct and I would strongly advise you have a technician check your work before you attempt to use it....if wired incorrectly you could have a serious delayed ignition as its possible to power the main burner instead of the pilot if you wire it up wrong below is a typical spark wiring diagram....may not apply totally to your system but it will give you the general idea79f9627.gif

Oct 31, 2009 | Heating & Cooling

3 Answers

Pilot is lit but the heater won't fire up

A few things dictate when the main burner turns on. One is a thermocouple not getting hot enough, the other is a bad thermostat ot thermostat wire, and another is the gas valve. First look at the gas valve located on the heater and make sure it is in the On position and not in the Pilot position. Remove your thermostat and jump the two wires together. The heater should light. If not, go back to the gas valve and find the wires up to the thermostat, the should be attached to terminals marked TH and MV or something similar. Jump the terminals. The heater should start. If not, you may need to replace the thermocouple.

Sep 04, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Laars LG 250,000 Bypassed Safty's But NO Burner Light

Have you checked your pilot generator voltage while everything is connected properly? You may have a shorted wire or limit or even thermostat. If you jump the TH connections on the gas valve, it would lead to shorted, inoperable safety, thermostat.

If everything is connected properly, the MV reading should be 500+, less than this and you are losing power somewhere.

Jul 07, 2009 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

My lennox furnace kicks on, then it shuts off

It should have a diagnostic set of leds on the board, with the code list on the door and the control board itself. If it get to the pilot stage and the shuts down its most likely the gas valve. You can check for continuity from mv to c on valve, you should have it. Then with a valtage test from mv to a ground or common as you here the next click of a relay on the board after the pilot has had a few seconds.

Mar 12, 2009 | Washing Machines

1 Answer

Groen tilt skillet 750 mv control

you need to check the generator in series with flame present. remove one wire from gas valve.put 1 of your meter probes under gas valve terminal where you removed one lead from powerpyle generator.put generator on other probe anything over 600 mv and your generators is ok under replace

Jan 14, 2009 | Cozy Enclosed Front Console Heater 20,000...

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