Hi,
I've got a problem with my central heating that I just can't fix.
I'll try and keep this simple but basically the fuse keeps blowing in the fused wall switch that supplies the bolier / controller. The boiler works fine when ONLY the hot water loop is running - it runs day after day with no problems at all. The same is true when ONLY the central heating is running - it works fine day in day out. The fuse blows everytime the central heating is or has been on AND THEN THE HOT WATER COMES ON. As soon as the relay clicks in the controller the fuse pops and everything goes dead. Both loops and the boiler system work fine individually so I don't understand which bit of the boiler / system is at fault. It only happens when the hot tank thermostat tries to flip the 3 way valve over to heat the hot tank AND the heating is/has been on.
My boilder is a Halstead Best 30 and the hot water system a conventional hot tank and 3 way valve to switch between water/heating or water and heating.
So far I have replaced the hot tank thermostat, the 3 way valve, the heating controller, the room thermostat and the Aquastat PCB inside the boiler all to no avail.
I'm at a loss now as the system functions fine with either loop running seperately but not together.
Any ideas will be greatly appreciated.... please help...
Thanks.
I've got a problem with my central heating that I just can't fix.
I'll try and keep this simple but basically the fuse keeps blowing in the fused wall switch that supplies the bolier / controller. The boiler works fine when ONLY the hot water loop is running - it runs day after day with no problems at all. The same is true when ONLY the central heating is running - it works fine day in day out. The fuse blows everytime the central heating is or has been on AND THEN THE HOT WATER COMES ON. As soon as the relay clicks in the controller the fuse pops and everything goes dead. Both loops and the boiler system work fine individually so I don't understand which bit of the boiler / system is at fault. It only happens when the hot tank thermostat tries to flip the 3 way valve over to heat the hot tank AND the heating is/has been on.
My boilder is a Halstead Best 30 and the hot water system a conventional hot tank and 3 way valve to switch between water/heating or water and heating.
So far I have replaced the hot tank thermostat, the 3 way valve, the heating controller, the room thermostat and the Aquastat PCB inside the boiler all to no avail.
I'm at a loss now as the system functions fine with either loop running seperately but not together.
Any ideas will be greatly appreciated.... please help...
Thanks.