This is just plain weird.
Swapped a system from vented hot water tank to direct twin immersion heater unvented tank.
Electric only house so added timer and a top/bottom switch so they can swap between upper immersion and lower immersion. This is powered from the old immersion heater switch.
Now comes the weird bit. Switched on and nothing. Checked with a multimeter 240v at the immersion.
The house does have electric underfloor that uses off peak but I don't think this is involved.
Checked all the way through thermostat is on immersion checks out resistance. Wire the immersion up directly to a normal plug socket. Immersion comes on and draws current I can see this on the meter.
Wire back up to the old immersion heater switch but use a 1.5kw blow heater as a load. Blow heater comes on no problem?? Back to the immersion and nothing.
Luckily the plug is convenient so wire the whole thing up to that and it works fine. Something is weird about the old immersion heater switch.
All I can think is a problem in the earthing at the old immersion heater switch? Immersion heater switch itself with a high resistance? Old immersion heater cable?
Swapped a system from vented hot water tank to direct twin immersion heater unvented tank.
Electric only house so added timer and a top/bottom switch so they can swap between upper immersion and lower immersion. This is powered from the old immersion heater switch.
Now comes the weird bit. Switched on and nothing. Checked with a multimeter 240v at the immersion.
The house does have electric underfloor that uses off peak but I don't think this is involved.
Checked all the way through thermostat is on immersion checks out resistance. Wire the immersion up directly to a normal plug socket. Immersion comes on and draws current I can see this on the meter.
Wire back up to the old immersion heater switch but use a 1.5kw blow heater as a load. Blow heater comes on no problem?? Back to the immersion and nothing.
Luckily the plug is convenient so wire the whole thing up to that and it works fine. Something is weird about the old immersion heater switch.
All I can think is a problem in the earthing at the old immersion heater switch? Immersion heater switch itself with a high resistance? Old immersion heater cable?