Remote Temperature Controller
The 9009069005 Temperature Remote Controller (TM-RE42) has two functions. It allows the output temperature from the water heater to be adjusted within the range of 100 °F to 160 °F (check Owner’s Manual for setting options), and it also works as a diagnostic tool that will give a concise error code whenever there is a problem with the unit.
For Use with the following models:
TK-110C-NI, TK-310C-NI, TK-510C-NI, T-H3, T-H3M, T-H3J, T-H3S, T-KJr2U, T-K4U, T-D2U