Re: boiler not working right
CC If you have 2 thermostats and only 1 pump like you say than you have to have zone valves. your pump is a taco 007 or 0010, the fuse like thing you saw is actully a start capacitor for the motor. If you follow your piping off the top of the boiler you should see 2 small motorized valves with wires going to them, they are probably 3 wire Taco5550 and might have a green or gold head, the head is the part where the wires are connected to.There are other types of zone valves,honeywell makes a 5 wire zone valve but Taco are the most common. Those valves have a very small 24vac motor that pushes down on a plunger to open them on a call for heat.The small arm you see is a lever to open the valves manually,if the arm moves up and down very easy than the valve is already open,if it moves up and down with a little force them you are opening manually, if it moves very hard than it is sticking and the little motor in it will not be able to open it on its own and it should be replaced.They can be stuck open,closed,or half way. They also can burn out if they stick very bad or are powered by a weak transformer which you can test buy finding it and putting a meter accross the terminals you should get at least 24vac with a full load when both thermostats turned up.I like to see 1 transformer for each zone valve,it is a little overkill but thy last longer that way.Ok back to your pump,did or can you test it for power to it,again,put a meter accross the 2 incomming wires look for 120vac. If you have power to it and it is not running,change the pump, those pumps can be very quite so listen very carefully.Just another thought we could be overlooking something very simple, your system could just be air bound and need to be purged.<br />Ok if you would check the following for me maybe we can narrow this down<br />1. turn up both thermostats,wait 5 minutes and check to see if the little arms slide very easy or not, this will tell us if the zone valves are at least opening.<br />2. check to see if you think the pump is running,can you hear it.<br />3. is the piping going away from the zone valves getting hot,if so see how far down piping is hot.Also is piping above the pump hot if so how far?<br />This will tell us if ther is any water moving through the pipes<br />You said the boiler it self is running ok and I guess you have a tankless coil for your domestic hot water.so that tells us it is working and now all we have to do is get your water pumpimg.