DIY Doctor UK DIY Forums

have imersion tank on timer switch.
switch started to mailfunction.
on inspection i found that both live terminals connecting blocks (supply in and out) had melted.
could anyone supply a reason for this and how to avoid it happening again.

[quote="mark c"]have imersion tank on timer switch.
switch started to mailfunction.
on inspection i found that both live terminals connecting blocks (supply in and out) had melted.
could anyone supply a reason for this and how to avoid it happening again.[/quote]

Probably simply screws not tight enough which creates resistance and thus heat at the terminal

Or the switch not rated high enough to match the heater load