We are getting no hot water to the radiators. Boiler seems OK - can make hot water. Pipes to tank are hot. pump seems to be working , boiler is in basement hot tank on first floor. Could it be valve somewhere ? - there is a honeywell silver box , valve thing on a pipe coming out the middel of the hot tank, the casing is quite hot even when the pipes are cold.). Is it thermostat ( have just given myself 240 when i took cover off to have a look)
Cheers Guys as usual. Nick