I have a weil-mclain boiler. The zone valve opens but no heat in zone. What do I do?

Honeywell 40004850-001 isn't working. The lever to manually open valve freely moves back and forth. What do I need to do to replace this valve?

I have a 3-zone system. Two area heating and one hot water. The zone valves are honeywell V8043E1012. The area heating zones work fine. The hot water zone valve receives signal from thermostat OK and opens The water flow valve. However, the boiler and circulator do not receive the signal to...

I have an old 4 story building with one thermostat controlling the steam heat to all floors. There is a commercial space on the ground floor and they are complaining that they don't get enough heat sometimes (and on occasion get too much!) They have suggested that there is some way to place a...

What does error code E-19 mean?

Hi, We have a 2 zone oil burner. The 1st zone (upstairs) runs separately and works no problem. The 2nd zone(basment), when we try to run 2nd zone separately , it seems to run zone 1(upstairs) and the baseboard heating upstairs gets hot and heats zone 1 even thought we have the t-stat set low...