www.hvactechgroup.com - forums

Hello;

The LWCO probe for the boiler has a very slow leak from the its stem. Pressure still holding good last year, 18 psi two storey building. 

Does it have seals inside to be replaced? Where can I buy a new one? I checked with Rona and Home Depot, the salesperson said they do not carry them.

Thanks.

https://m.johnstonesupply.com/storefront/product-view.ep?pID=L42-933

Or Home depot, in the US, sells it for $119 and may be ordered online,

http://m.homedepot.com/p/Unbranded-Safeguard-170-Series-Low-Water-Cut-Off-Control-45-175/202312883

Download the Safeguard M170 instructions - Here (http://www.hvactechgroup.com/files/Safgard%20M170.pdf)

QuoteMAINTENANCE
When installed on a residential hot water heating system, the probe should be removed and cleaned every five years. When installed on a commercial application, the probe should be removed and cleaned annually. After cleaning the probe, perform the Operational Test Procedure described above.

Usually the LWCO is a add on control and you could use any 120V 50psi control.  The link above should be what you're looking for, but any HVAC / Plumbing wholesaler should stock something similiar.