Troubleshooting Chart - A.O. Smith Vortex HPTU-50 Installation Instructions And Use & Care Manual

TROUBLESHOOTING CHART

PROBLEM
"No Hot Water" on page 24
"Insufficient Hot Water or Slow
Hot Water Recovery" on page
26
"Temperature Too High" on page
26
"Low Water Pressure" on page
26
"Water Odour" on page 25
22 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide
POSSIBLE CAUSE(S)
1. No power to the water heater (No
lights on the unit are on).
2. Unit in Vacation mode
3. ECO open
4. Hot water usage pattern exceeds the
capability of the water heater in cur-
rent mode
5. Non-functioning upper temperature
sensor
6. Faulty thermostatic mixing valve.
7. Leak in plumbing system
1. Temperature set-point too low
2. Air filter dirty
3. Hot water usage pattern exceeds the
capability of the water heater in cur-
rent mode
4. Water connections to unit reversed
5. Heat lost through long run of exposed
pipe
6. Hot water leak at faucet or piping
7. Non-functioning heating element
8. Sediment or scale build up in tank
9. Incorrectly installed outlet j-tube.
10. Thermostatic mixing valve faulty/set
too low.
11. Low supply voltage.
1. Non functioning thermostat.
2. Grounded/shorted heating element.
3. Thermostatic mixing valve faulty.
1. Partially closed supply valve
1. A concentration of sulfate in the sup-
ply water
2. Little or no dissolved oxygen in the
water
3. A sulfate reducing bacteria which has
accumulated within the water heater
(this harmless bacteria is nontoxic to
humans).
4. An excess of active hydrogen in the
tank. This is caused by the corrosion-
protective action of the anode.
CORRECTIVE ACTION
• Check for blown fuse or tripped breaker.
Restore power to unit.
• Press Mode/Enter button and return to
desired operating mode (page 17).
• Reset the Energy Cut Off (ECO) switch; see
"To check the Energy Cut Off (ECO)" on page
25
• Change to different mode or modify usage
patterns (page 17).
• Contact a qualified person for service.
• Check hot water at other faucets.
• Check hot water side of home's plumbing
system for leaks.
• Increase set point temperature; see
"Adjusting the
Temperature" on page 16.
• Clean air filter (page 32).
• Change to different mode or modify usage
patterns (For example if in Efficiency Mode
switch to Hybrid Mode, page 17).
• Ensure the cold connection is at the bottom
and that the hot connection is at the top.
• Insulate exposed piping
• Repair hot water leaks
• Call qualified person for service
• Drain and flush tank. Water conditioning
may be necessary to minimize build up
(page 28).
• Check orientation of alignment mark with
arrow, re-install if necessary.
• Check hot water at other faucets.
• Contact utility company to verify voltage.
• Replace ECO (page 30).
• Replace heating element (page 29).
• Check hot water at other faucets.
• Open supply valve completely.
• Contact qualified person for replacement of
anode.