Hi
I have recently changed a Economy 7 immersion control box as I believed the last one had failed. However, the new one (Horstmann BX2000) is still showing the same problems as the old one.
Basically, the immersion works when the 'boost' is manually activated, but fails to operate during the E7 hours. During the E7 hours the 'off-peak' LED on the box illuminates, but the immersion still fails to operate. I have double-checked this with a multimeter and there is 248V going into the control box from the E7 supply, but 0V at the output to the immersion. (this was exactly the same scenario with the old control box - so perhaps it was not at fault after all). Also, I can hear the relay in the box switching when the E7 supply is activated, so to me the control box seems to be doing its job.
I have ruled out there is a problem with the immersion element as it works 100% of the time on boost, but to date has not worked through the E7 supply. The control box is fed by two consumer units (one for the 24hr supply and one for the E7 supply). Also, it is a single element hot water tank. (Sorry for the poor circuit diagram!)
E7 CU
l
l
Control Box------------24 hr CU
l
l
l
isolating switch
l
l
immersion element
I have checked all connections and continuity (all seem ok) but now I am stuck for ideas. Any ideas would be most welcome…
Thanks
I have recently changed a Economy 7 immersion control box as I believed the last one had failed. However, the new one (Horstmann BX2000) is still showing the same problems as the old one.
Basically, the immersion works when the 'boost' is manually activated, but fails to operate during the E7 hours. During the E7 hours the 'off-peak' LED on the box illuminates, but the immersion still fails to operate. I have double-checked this with a multimeter and there is 248V going into the control box from the E7 supply, but 0V at the output to the immersion. (this was exactly the same scenario with the old control box - so perhaps it was not at fault after all). Also, I can hear the relay in the box switching when the E7 supply is activated, so to me the control box seems to be doing its job.
I have ruled out there is a problem with the immersion element as it works 100% of the time on boost, but to date has not worked through the E7 supply. The control box is fed by two consumer units (one for the 24hr supply and one for the E7 supply). Also, it is a single element hot water tank. (Sorry for the poor circuit diagram!)
E7 CU
l
l
Control Box------------24 hr CU
l
l
l
isolating switch
l
l
immersion element
I have checked all connections and continuity (all seem ok) but now I am stuck for ideas. Any ideas would be most welcome…
Thanks