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Double Element, Simultaneous, Three Phase
Operation.
Water In Tank Is Cold Or Not Enough Hot
Water With Power ON.
1. This procedure assumes line voltage,
ECO and elements are in working order.
2
. Adjust temperature setting for both
thermostats to the highest setting.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
4. Check across terminals L4 and T2 of
upper thermostat (see illustration 18).
A) Rated voltage NOT present,
Recheck ECO (see page 14).
If ECO is okay, replace
thermostat.
B) Rated voltage IS present,
proceed to next step.
5. Check across upper element terminals
(see illustration 19).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
6. Check across terminals L1 & L3 of
lower thermostat (see illustration 20).
A) Rated voltage NOT present,
check wire connections from
upper to lower thermostats.
B) Rated voltage IS present,
okay, go to step 7.
7. Check across terminals L4 and T2 of
lower thermostat (see illustration 21).
A) Rated voltage NOT present,
Recheck ECO (see page 14). If
ECO is okay, replace thermostat.
B) Rated voltage IS present,
proceed to next step.
8. Check across lower element terminals.
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS 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 original
temperature settings as found prior to
thermostat testing
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S
ERVICE PROCEDURE RE-III
Residential Thermostat Testing
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