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SERVICE PROCEDURE E32-IV
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 8
Water In Tank Is Cold With Power ON.
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
4. Check across terminals L1 & L3 of thermostat
(see illustration 8)
A) Rated voltage NOT present,
Check fuses.
B) Rated voltage IS present,
proceed to next step.
5. Check across terminals L4 and T2 of
thermostat (see illustration 9).
A) Rated voltage NOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltage IS present, okay thermostat is
calling for heat, proceed to next step.
6. Check across element terminals
(see illustration 10).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing
see page 11.
Illustration 10
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
4. See illustration 9 above, check across terminals L4 and T2 of thermostat.
A) Rated voltage IS present,
replace thermostat.
B) Rated voltage NOT present,
thermostat is okay.
C) Lower than rated voltage IS present,
recheck for grounded element
(see page 11).
Page 14
Thermostat Operation Testing
Illustration 9