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SERVICE PROCEDURE RE-III
Residential Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 6
Single Element Operation or
Double Element, 4 Wire, Simultaneous, Single Phase
Operation.
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 L4 and T2 of
thermostat (see illustration 6).
A) Rated voltage NOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltage IS present,
proceed to next step.
5. Check across element terminals
(see illustration 7).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
Illustration 7
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 6 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 15).
Reference 4 Wire, Simultaneous, Single Phase
Wiring diagram.
NOTE: Wiring consists of two single element configurations
operating independently.
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