Double Element, Simultaneous, Three Phase
Operation.
Water In Tank Is Cold Or Not Enough Hot
Water With Power ON.
1. This procedureassumes line voltage,
ECO and elements are in working order.
2. Adjust temperature settingfor both
thermostats to the highest setting.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
4. Check acrossterminals L4 and T2 of
upper thermostat (see illustration 18).
A) Rated voltageNOT present,
RecheckE CO (see page 14).
If ECO is okay, replace
thermostat.
B) Rated voltageIS present,
proceed to next step.
5. Check acrossupper element terminals
(see illustration 19).
A) Rated voltageNOT present,
check wire connections from
thermostat to element.
B) Rated voltageIS present,
Repeat element testing
see page 15.
6. Check acrossterminals L1 & L3 of
lower thermostat (see illustration 20).
A) Rated voltageNOT present,
check wire connections from
upper to lower thermostats.
B) Rated voltageIS present,
okay, go to step 7.
7. Check acrossterminals L4 and T2 of
lower thermostat (see illustration 21).
A) Rated voltageNOT present,
Recheck ECO (see page 14). If
ECO is okay, replace thermostat.
B) Rated voltageIS present,
proceed to next step.
8. Check acrosslower element terminals.
A) Rated voltageNOT present,
check wire connections from
thermostat to element.
B) Rated voltageIS present,
Repeat element testing
see page 15.
WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Illustration 18 Illustration 19
Illustration 20 Illustration 21
WARNING
Be sure thermostats are reset to their originaltemperature settings as found prior tothermostat testingPage 21
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
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