My boiler is set to the aquastat all the way down to 140 and the burner will fire until 200 is reached then shut off after the relief valve shoots out steam and water. I am not sure if it does this because there is a limit, but seems like the connection from my thermostat to the boiler isn't working. Thermostat is wired properly, but when I set the thermostat to 15C, it goes up to 20C at times, can anyone help? I have a technician coming in during the week but is cold and would like to see if i can fix this. I have heat just have to manual shut down the power to the boiler because it reaches 200 which throws the relief valve open. With the high and low points on the relay set to the lowest, why is it going to 200? wiring problem?
You did no longer provide enuf information. warm water or steam boiler? Why might all and sundry drain the water in any case? that shows a circulating warm water gadget. previous boilers do assemble crud of their water, even with the shown fact that it often generally maintains to be in suspension. even with the shown fact that- 'stale' water has no oxygen left to corrode your gadget. If the serviceperson left the boiler empty for any length of time it rather is possibly that below dry circumstances the 'crud' hardened on the exterior of the nice and comfortable water coil and is appearing as insulation that isn't enable the water to warmth. The coil is possibly replaceable, yet I have not have been given any concept what share $. Re the 'boiler' reducing out- that's maximum possibly the oil burner- which might desire its annual cleansing, however the boiler does have protection contraptions to keep away from it from working below risky circumstances. that's way less possibly, yet nevertheless conceivable. For merely relatives warm water a separate water heater may be extra convenient and particular much less costly. BTW- a sparkling boiler might maximum possibly be smaller and lots extra powerful. extra desirable ask around for a good serviceman. it rather is rather worth a attempt to ask the guy who supplies your gas oil.
Although your aquastat is set to 140, it may be faulty and stuck closed meaning the internal contacts (switch) won't separate (open) when 140 degrees is reached. Think of the aquastat as 2 pieces of wire. when your boiler is 120 degrees the 2 pieces of wire are touching and the electricity can make the burner work. When the Temperature reaches 140 deg, the 2 wires separate and the burner shuts off. For some reason the aquastat's contacts are not separating. Shut off the power to the boiler, and TRY adjusting the aquastat screw up and down a few times quickly, and tap it with a screwdriver handle without breaking it. This MIGHT make it start working until the service tech comes out. Its a chance. I don't think it has anything to do with the upstairs t-stat. The t-stat should be ABLE to be left at 90 forever and never have your boiler's temp reach higher than the aquastat and never have the relief pop. Good luck ****The aquastat where you adjust it. adjust it up and down a few times kinds quickly. Then with the handle of the screwdriver rap the aquastat box. You're trying to vibrate the stuck contacts loose. if you wanna be a little more courageous, make sure the power is off. take the cover of the aqustat off and poke around with your finger hoping to seperate the stuck contacts. Good luck. Its a possibility. Sorry this is a educated guess without seeing it. Turn on the switch when your done. I hope you get heat.
