Low Water Cutoff Replacement

brucewo1b

10 years old or you don't know how old replace it, and ASAP as a non functioning LWOC is a danger, please call someone ASAP and have them go over the operation while they are there.

Greg T.

Low-Water Cutoff Replacement

The low-water cutoff (McDonnell & Miller, of course) on my Weil-McLain boiler (circa 1969) does not function. (The previous owners of my house apparently did not practice good boiler maintenance.) Does the whole unit need to be changed or can the float mechanism be replaced? Is this something I can attempt to replace myself?

Edward A. (Ed) Carey_3

LWCO

In the I&O Manual for a float type MM LWCO, they recommend replacement of the LWCO after 10 years of operation. If it is circa 1969, and it has not been VERY WELL maintained, it should be replaced immediately.

Do not delay.

Best case scenario, your boiler operates devoid of water and the boiler is destroyed.

Worse case scenario, you boiler ignites light combustibles in the vicinity (that should not be there) and the boiler takes the house along with it.

Not a joke, I have seen both on more than one occasion.

THANKFULLY, NOT MY JOBS OR CUSTOMERS!!!!!

Ed Carey

Norm Harvey

The float is easily replaced without a need to replace the whole unit. Make sure to reallm clean out the inside of the float chamber and scrape out sediment from every angle.

So long as you know to shut off power to your boiler and drain it down before you attempt the repair I don't see why a homeowner couldn't do it. Make sure it operates properly after your repair.

In my opinion this kind of repair is simmilar to a homeowner replacing a light switch. Its not terribly difficult, nor does it pose a safety hazard to anyone with some common sense. Jus make sure you replace the replace the wires to the same terminals you removed them from.

I would recommend replacing the switch along with the float.

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Alan_11

# 67

Believe the replacement part # is 6667 which includes float and switch. Do it as Norm said, also would replace blowdown valve with ball valve type if not already done.If you start removing the machine screws holding it in place and they don't come out easy be patient and use penatrating oil,they break easy and then it's time to replace the whole thing.