WARNING
High voltage exposure. Use caution to avoid
personal injury during this procedure.
Double Element, Non-Simultaneous, Three 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 13).
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 14).
A) Rated voltageNOT present,
check wire connections from
thermostat to element.
B) Rated voltageIS present,
Repeat element testing,
see page 15.
Illustration 13 Illustration 14
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 13 above, check voltage across terminals L4 & 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 T4 of upper thermostat & L3 of lower thermostat
(see illustration 15).
A) Rated voltageNOT present, replace upper thermostat.
B) Rated voltageIS pres ent, upper thermostat is okay. Go to step 7 on next
page.
Illustration 15
Page 19
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
19