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I have a weil-mclain CGA-4-SPDN gas boiler, and can not get the pilot light to stay lit. Following the directions reset setting the valve to the off position then to pilot press the red button, lite the pilot and hold for a min. or more as soon as I release the button the pilot flame goes out.

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  • 108 Answers

You need to replace the Thermocouple. (pilot safety device) It would be best to call a Technician about this.

Posted on Oct 22, 2008

  • Ray Oct 25, 2008

    I hope your problem is solved. Home Depot carrys many thermocouples. It could be difficult to replace. Follow all instructions.

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Light the pilot light on weil mclain gas boiler


Joanne If there is a standing pilot on the boiler. Put the gas valve to the pilot setting and push in on the valve while holding a long match or BBQ lighter @ the pilot assembly that is behind the small access port at the top of the gas train assembly. Dont hold the pilot knob doun without having a flane @ the gas outlet of the pilot assembly or gas will build up and could blow out of the port and hold the gas valve in for about a minute or two and let it go it should stay light when you let it go .If it does not sta lit and it IS a standing pilot there- is a thermo-coupling that may be bad If the pilot does not stay lit.
If there is an electronic ignition rather than a standing pilot then you do not need to light it will light itself if the electronic ignition is bad or if the flame sensor is dirty. If you remove the pilot assembly from the gas train and clean the flame sensor rod with a piece of .0000 steel wool it could help. If not you may want to call a licensed pipe-pitter ( OR plumber depending where you live and the local codes).
If you don't thing you could do it yourself then call a licensed pipi-fitter or plumber. (Gas only has to leak once for there to be a problem so please do call someone licensed if you don't think you could do it your self.), http://www.weil-mclain.com/en/weil-mclain/products-services/
Here is a link to the manufacturer you should be ale to fing your equipment and the install instructions, if you look around .You can download a PDF and print it
Good luck and stay warm

Feb 08, 2014 | Weil-McLain CGa-25-SPDN, NG, Gas Fired...

1 Answer

Hot water boiler pipes are banging


First step is to bleed all air from the system. Add more manual vents and have at least one automatic air vent if necessary to properly bleed. An air filled compression tank without a bladder makes it difficult to control air in the system; system pressure is difficult to control. An air tank without bladder is more common in older systems. Replacing an air compression tank with a pre-charged bladder tank can be a great benefit in maintaining system pressure. If a bladder tank is already in place it may have a leak after many years of use. If the problem persists, then check the bladder to see if it has a leak. This may not be easily done during system operation and requires removal. Tanks come in various sizes; get a larger rather than smaller tank. A great help in the long run and will pay for itself in service calls quickly.

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When is the last time you had it serviced By a Tech?

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2 Answers

Water leaking inside boiler keeps putting out the pilot light


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1 Answer

Have a water leak inside boiler keeps putting pilot light out


Not good at all. Check for a fill level probe/float/sensor that may be acting up causing the unit to over fill, or you may be looking at buying a new boiler.

Feb 18, 2013 | Weil-McLain CGa-25-SPDN, NG, Gas Fired...

2 Answers

Make : Weil-McLain Model : CG-5-SPDN Series 12 I have the above mentioned boiler which is located on the 1st level of a three story one family house, the area where the boiler is located is insulated.


You don't have an optimum distribution of steam in your house. Try closing a little bit the valves supplying the heaters in the lower floors. Close a little bit more until you get the desired balance.

Nov 06, 2012 | Heating & Cooling

1 Answer

CGA Mclain .Natural Gas boiler issue 70k btu with a effikal ventx damper, model RVGP. There is no blower for ventilation, no control board with lights. Pilot light will not stay lit. have already replaced...


hey Carli suspect you mean the pilot goes out as soon as u turn your gas control valve back to the on position!? If this is so, you will have to probable reset the flue spill switch located right at the exaust outlet. OR, SOMETIMES THEY HAVE ANOTHER LIMIT switch in the same circuit in series. If the pilot goes out when u release the pilot press down knob, then it is your thermo couple is loose or fininshed,or the pilot flame is not aimed properly at the sensor (thermo couple)

Sep 21, 2011 | Heating & Cooling

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