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SERVICE PROCEDURE E32-III
Fuse Testing
Fuse Testing
1. Turn “OFF” power to water heater.
2. Open control box located at the top of the heater to
allow access to fuse block.
3. Disconnect wire leads from fuse block. NOTE: It may be
necessary to label wires for proper re-connection when
finished.
4. Set multi-meter to the “Ohms” setting.
5. Check continuity across upper and lower screw terminal
of fuse block for each individual fuse, six total
(see illustration 6).
A) Continuity IS present, fuse is okay.
B) Continuity NOT present, Replace with new fuse
Class “G”, 480 Volt MAX, 30 Amp.
Illustration 6
Page 13
1. This procedure assumes line voltage and
fuses are in working order.
2. Turn power “OFF” to water heater.
3. Remove thermostat/element access cover(s) located
near the bottom of the water heater.
4. Remove insulation and plastic cover from thermostat.
5. Turn power “ON” to water heater.
6. Check voltage across terminals L1 & L4 for all thermostats
(see illustration 7).
A) Rated Voltage IS present, ECO is okay.
B) Rated voltage NOT present, proceed to step 7.
7. Turn power “OFF” to water heater and firmly press ECO reset button on thermostat(s).
Turn power “ON” to water heater and recheck voltage across terminals L1 & L4 of thermostat(s).
A) Rated voltage IS present, the ECO has previously opened indicating the water in the tank, at
some point did overheat, Check the following:
1. Thermostat must be in full contact with tank.
2. Be sure heating element(s) is not shorted to ground (see page 11).
3. Proper thermostat operation (see procedures on page 14).
B) Rated voltage NOT present, water in tank may be over heated.
1. If water is hot, turn “OFF” power to water heater and flow water through tank to cool below set point
of upper thermostat. Recheck voltage per step 6.
2. If water is cool, Replace thermostat(s).
ECO (high limit) testing
ECO reset
button
WARNING
High voltage exposure. Be sure power is turned
OFF to water heater prior to performing this
procedure.
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 7