I have just replaced my indirect HW cylinder as the coil was burst ( water flowing back into central heating F & E tank and out the overflow )
When I refilled the new HW cylinder & heating system I turned on the CH & HW and the water level in the cold water tank in the loft rose and poured out the overflow , while this was happening the water level in the F & E tank dropped and the supply valve was continually feeding the F & E tank. I turned the heating off and have drained the cw tank with the cold water supply valve closed. When I turn the heating on the water is flowing from the hot water cylinder back up the supply pipe into the cold water tank. Is the coil in the new HW cylinder burst ? or am I missing something ?
When I refilled the new HW cylinder & heating system I turned on the CH & HW and the water level in the cold water tank in the loft rose and poured out the overflow , while this was happening the water level in the F & E tank dropped and the supply valve was continually feeding the F & E tank. I turned the heating off and have drained the cw tank with the cold water supply valve closed. When I turn the heating on the water is flowing from the hot water cylinder back up the supply pipe into the cold water tank. Is the coil in the new HW cylinder burst ? or am I missing something ?