ETC’s ELTS 1 is equipped with ice cube-style relays manufactured by ASCO and IDEC. Those relays may fail by fusing closed due to overvoltage and cause sporadic behavior within the ELTS 1.
To check for fusing within the relay, refer to the table below for resistance values between pins A and B as shown on the image. If you are not reading the values in the table, it is likely that your relay has failed and will need to be replaced.
These relays are not available for sale from ETC. They are available from many suppliers online and from electrical wholesalers.