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PROBLEM CORRECTIVE ACTION
NO HOT WATER 1. 1.
INSUFFICIENT HOT WATER/
SLOW HOT WATER
RECOVERY
HIGH OPERATION COSTS
DRIP FROM TEMPERATURE &
PRESSURE RELIEF VALVE
(Warning: Do not plug or cap
T&P discharge pipe.)
OTHER
2,
3.
POSSIBLE CAUSE(S)
No power to the water heater (power
button not lit)
Unit in standby (power button RED)
Unit in Vacation mode
4. High temperature limit switch open
5,
6,
1.
Hot water usage pattern exceeds the
capability of the water heater in
current mode
Non-functioning upper temperature
sensor
Temperature set-point too low
2. Air filter dirty
3. Hot water usage pattern exceeds the
capability of the water heater in
current 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
1,
2.
3.
4.
5.
6.
7.
Temperature set-point too high
Air filter dirty
Electric mode selected
Water connections to unit reversed
Heat lost through long run of exposed
pipe
Hot water leak at faucet or piping
Sediment or scale build up intank
1. Excessive water pressure
2. Thermal expansion
3. Non-functioning Temperature &
Pressure Relief Valve
1. The water heater does not
immediately start
2. The heat pump does not run in
Efficiency mode.
Check for blown fuse or tripped breaker.
Restore power to unit then press power
button.
2. Press the power button to turn the unit on
(power button GREEN)
3. Press Vacation Mode Button to exit Vaca-
tion mode and return to desired operating
mode.
4. Reset the high temperature limit switch;
see "Safety shut-off' section for more
information
5. Change to different mode or modify usage
patterns
6. Contact a qualified person for service
1. Increase set point temperature; see
"Adjusting the User Interface Module"
section
2. Clean air filter
3. Change to different mode or modify usage
patterns (For example if in Efficiency Mode
switch to Hybrid Mode)
4. Ensure the cold connection is at the bottom
and that the hot connection is at the top
5. Insulate exposed piping
6. Repair hot water leaks
7. Call qualified person for service
8. Drain and flush tank. Water conditioning
may be necessary to minimize build up
1. Decrease set point temperature; see "Ad-
justing the User Interface Module"
2. Clean air filter
3. Change to Efficiency or Hybrid mode for
reduced energy costs
4. Ensure the cold connection is at the bottom
and that the hot connection is at the top
5. Insulate exposed piping
6. Repair hot water leaks
7. Drain and flush tank. Water conditioning
may be required to minimze build up
1. Check water supply inlet pressure. Ifhigher
than 80 PSIG, install a pressure reducing
valve (50-60 PSlG is the recommended
pressure.)
2. See "Closed System/Thermal Expansion"
section
3. Replace the Temperature & PressureRelief
Valve
1. When first started the water heater takes
about 8 minutes to complete a diagnostic
routine
2. Contact aqualified person for service
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