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Fix one thing, Break another
I have been living in my home for the past 7 years. This house is bit old and has Steam Furnace with Radiators. I called a boiler guy to come since for the past 2 weeks I kept losing power to my thermostat controller (Nest). I had to manually hold down this little red button for about 10 seconds to get the power back so I can get power to the thermostat to turn the heat on. The boiler guy came and replaced the little power module box. Also while there he asked me when was the last time I cleaned out the system. I told him I never had. I never knew I had to (first time homeowner here). He went ahead and opened the blow down valve and a bunch of slug really dark sediment came out. He did this several times until the water was relatively clear and filled the water up again. He left with the heat still working and I thought all would be good.
The next day comes and I notice my furnace has not turned on and the temperature is 66, when the temperature should be 70. The thermostat has power and is set to heat up. But the furnace is not triggering on. I decided to add a little more water and mess with the blow down valve. After doing that the furnace kicked on and ran until the heat was back to set temperature.
But this this happens everyday now. I have to toy with adding water and playing with the blow down valve to get the system to turn on. Any reason why this is now a problem when it never was before. The LWCO I have is a McDonnell & Miller Series 47-2. Are there any troubleshooting steps I can take. I downloaded/printed out the manual and read it. I was hoping to find instructions on how to open the float chamber and manually clean it out and check float, but I was not able to find anything. Any help would be appreciated. Thanks.