The green light only means power. When a zone is activated there will be a red light next to the zone. You probably don't have the cover all the way pushed on the control.
R,
You have 3 pumps. Have you checked if Z1 pump is running when not calling for heat. When the Z1 light is on that stat is calling for heat. Can't tell but I believe you have cube relays in there which could be observed if the cover were removed. With 3 zones you could try switching cubes with one you know is working to see if that solves the problem.
Looking at the pic you sent it looks like just the power light is on and not Z1 but cannot be sure. If the Z1 light is not on you may have a bad Flocheck that allows water to flow constantly whenever any zone calls.
With cover off, and you still getting unwanted heat you can remove 1 stat wire from the control and see if pump stops. If pump stops you either have a bad stat or you may have a short in your stat wire.
I have an HB Smith oil-fired boiler with a Flex2 HTX 30 expansion tank from October 2010.
After returning from a short vacation, I simultaneously cranked up the heat on all 3 zones. After about an hour, I noticed the internal boiler pressure was at 40 PSI and the relief valve was leaking.
I released some of the pressure and that has since resolved both the pressure (now at 30 PSI) and the leaking.
This got me to thinking about the age of the expansion tank. Should I proactively replace it?
First time here: [b]Slant-Fin Intrepid Boiler-Oil, [/b]Mod. T30PT
I never hooked up the domestic coil to the system (have electric water heater), what should I set the differential setting to save oil, all the way down or all the way up.
Or can I jumper a wire between two terminals so it doesn't cycle as much.
Thanks
12-15-22, 12:55 PM
