WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Double Element, Non-Simultaneous, Single Phase
Operation.
Water In Tank Is Cold With Power ON.
1. This procedureassumes 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 acrossterminals L4 and T2 of
upper thermostat (see illustration 8).
A) Rated voltageNOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltageIS present,
proceed to next step.
5. Check acrosselement terminals
(see illustration 9).
A) Rated voltageNOT present,
check wire connections from
thermostat to element.
B) Rated voltageIS present,
Repeat element testing
see page 15.
Illustration 8
Tank Does Not DeliverE nough Hot Water.
1. This procedureassumes line voltage, ECO and
elements are in working order.
2. Turn power “ON” to water heater and set multi-meter to “Volts AC”.
3. Adjust temperature settingof upper thermostat to the highest setting.
Water temperature in tank must be below thermostatsetting for this test.
4. See illustration 8 above, check voltage across terminals L4 and T2 of upper
thermostat.
A) Rated voltageIS present, okay, upper thermostat is
calling for heat. Go to step 5 below.
B) Rated voltageNOT present, replace upper thermostat.
5. Adjust temperature settingof upper thermostat to the minimum setting.
Water temperature in tank must be above thermostat setting for this test.
6. Check voltageacross terminals L4 and T4 of upper thermostat
(see illustration 10).
A) Rated voltageNOT present, replace upper thermostat.
B) Rated voltageIS present, thermostat is okay. Go to step 7 on next page.
Illustration 9
Illustration 10
Page 17
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
17