Baxi 401 no hot water

[Neil670]

hi. Having changed a radiator I now have no hot water. I turned off the water supply to the radiators before draining and changing the rad. After changing I turned the water supply back on and bled the rads of air. They get lovely and hot only now the hot water is cold. The back boiler fires up but it doesn't seem to reach the hot water tank. The tanks in the loft are full and the immersion heater heats the water fine. The flow of water from the taps is normal. There doesn't seem to be any bleed nipple around the tank. The pump fires up with the heating but not when switched to water only. It's a Baxi Bermuda 401 system. Any help or advise would be a great thing right now. Oh and I have drained the heating on a previous occasion but not had this problem

 

[FiremanT]

Occasionally, you have to bleed the coil. Does a vent pipe come off the top of the flow pipe (top of coil). If not, you sometimes have to crack the union to release air.

 

[Neil670]

Thanks for the reply. Ok. I guess you mean the hot water tank. It's just a couple of wires on the top and a wiring box I guess and the pipe out of the top of the tank is I think the water supply from the back boiler

 

[FiremanT]

No.

Can you post a picture of the copper cylinder?