We purchased a second hand Simpson minimax 10,which trips the circuit breaker / safety switch on Hot or warm ok on cold. so far done the following
1. Tested the heater element and ok
2. checked for low resistance to earth on heater element and ok
3. replaced the heater element
4. checked for low resistance to earth on timer switch and hot / cold /warm switch and seems ok.
5. Tried next door neighbour safety switch and same result.
Noticed that motor is running very hot on cold cycle. ?
6. Checked thermostat and looks ok.

Mark, May 2017

The fact it runs ok on cold then motor must be ok. On hot or warm then heating circuit comes in to play, so Iwould suspect the fault lies there. If the element you put in is a new one then that would eliminate that and really only leaves a bad wire somewhere.

Lincoln Appliance NZ, May 2017