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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 procedure assumes 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 across terminals L4 and T2 of
upper thermostat (see illustration 8).
A) Rated voltage NOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltage IS present,
proceed to next step.
5. Check across element terminals
(see illustration 9).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
Illustration 8
Tank Does Not Deliver Enough Hot Water.
1. This procedure assumes 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 setting of upper thermostat to the highest setting.
Water temperature in tank must be below thermostat setting for this test.
4. See illustration 8 above, check voltage across terminals L4 and T2 of upper
thermostat.
A) Rated voltage IS present, okay, upper thermostat is
calling for heat. Go to step 5 below.
B) Rated voltage NOT present, replace upper thermostat.
5. Adjust temperature setting of upper thermostat to the minimum setting.
Water temperature in tank must be above thermostat setting for this test.
6. Check voltage across terminals L4 and T4 of upper thermostat
(see illustration 10).
A) Rated voltage NOT present, replace upper thermostat.
B) Rated voltage IS present, thermostat is okay. Go to step 7 on next page.
Illustration 9
Illustration 10
Page 17
SERVICE PROCEDURE RE-III
R
esidential Thermostat Testing
17