RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company
Training Department
©
2002
Ashland City, Tennessee
37
Residential Electric – continued
A-6 service Voltage Check “No Hot Water” – continued
Test between Thermostat 2 and High Limit 4 or T2 and L4
If …
… then
supply voltage is present:
continue.
supply voltage is not present
•
check jumper between high limit 2 and
thermostat 1.
•
replace thermostat – (tank must be 15
°
F
cooler than setting to activate thermostat.
Complaint: Lack of Hot Water
Conditions:
Upper thermostat satisfied
Lower portion of tank still calling for heat
Test between high limit 4 and thermostat 4 and L4 and T4
If …
… then
correct supply voltage is present
continue.
correct supply voltage is not present
•
check that tank water temp has satisfied
the upper thermostat.
•
replace the upper thermostat.
Test between high limit 4 and lower thermostat 1 or L4 and 1
If …
… then
correct supply voltage is present
continue.
correct supply voltage is not present
check wiring connections.
Test between high limit 4 and lower thermostat 2 or L4 and 2
If …
… then
correct supply voltage is present
continue.
correct supply voltage is not present
replace lower thermostat.
