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WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Double Element, Simultaneous, Single 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.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”
5. Check across terminals L4 and T2 of
upper thermostat (see illustration 35).
A) Rated voltage NOT present,
Recheck upper ECO
(see page 14). If ECO
is okay, replace upper thermostat.
B) Rated voltage IS present,
proceed to next step.
6. Check across upper element terminals
(see illustration 36).
A) Rated voltage NOT present,
check wire connections from
thermostat to upper element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
7. Check across terminal L3 of upper thermostat
and T2 of lower thermostat (see illustration 37).
A) Rated voltage NOT present,
Check ECO (see page 14) & wire
connections at upper & lower
thermostats. If okay,
replace lower thermostat.
B) Rated voltage IS present,
proceed to next step.
8. Check across lower element terminals
(see illustration 38).
A) Rated voltage NOT present,
check lower element wire
connections to the thermostats.
B) Rated voltage IS present,
Repeat lower element testing
see page 15
Illustration 35
Illustration 36
Illustration 37 Illustration 38
WARNING
Be sure thermostats are reset to
their original temperature settings
as found prior to thermostat
testing
Page 27
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
27