I have a Grant Oil Boiler - Vented system - 4 zone valves - two automatic bleed valves near the pump and H/W cylinder Upstairs and the Boiler is downstairs.
I started the system and set the thermostats to call for heat.
After a minute or so I kept hearing soft thump sounds from boiler, it seemed like water was being overheated.
I checked the flow pipe out of the boiler and that was cold even after a few minutes.
so
I checked the pump was running and that the zone valves operated.
I then checked that the c/h tank in the loft had water in it and that the stopcock was working.
I bled the Pump - small drips out of it but didn't hear any air.
I even cleaned the Magnetic filter to see if that might be blocked up.
I turned the pump up high and small drips of water came from both auto bleed valves so I think they have water in them ok.
Now I can't think what else to do.
I suppose pump could be blocked, it sounded ok but...
any ideas would be appreciated.
thanks
Mike
I started the system and set the thermostats to call for heat.
After a minute or so I kept hearing soft thump sounds from boiler, it seemed like water was being overheated.
I checked the flow pipe out of the boiler and that was cold even after a few minutes.
so
I checked the pump was running and that the zone valves operated.
I then checked that the c/h tank in the loft had water in it and that the stopcock was working.
I bled the Pump - small drips out of it but didn't hear any air.
I even cleaned the Magnetic filter to see if that might be blocked up.
I turned the pump up high and small drips of water came from both auto bleed valves so I think they have water in them ok.
Now I can't think what else to do.
I suppose pump could be blocked, it sounded ok but...
any ideas would be appreciated.
thanks
Mike