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TROUBLESHOOTING CHART
PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION
NO HOT WATER Hot water usage pattern exceeds the 1.
capability of the water heater in
current mode
No power to the water heater2.
Unit in standby3.
Unit in Vacation mode4.
High temperature limit switch open5.
Non-functioning upper temperature 6.
sensor
Change to different mode or modify usage 1.
patterns
Check for blown fuse or tripped breaker. 2.
Restore power to unit then press power button.
Press the power button to turn the unit on3.
Select mode other than Vacation4.
Reset the high temperature limit switch; see 5.
“Safety shut-off” section for more information
Contact a qualified person for service6.
INSUFFICIENT HOT WATER/
SLOW HOT WATER
RECOVERY
Temperature set-point too low1.
Air filter dirty2.
Hot water usage pattern exceeds the 3.
capability of the water heater in
current mode
Water connections to unit reversed4.
Heat lost through long run of exposed 5.
pipe
Hot water leak at faucet or piping6.
Non-functioning heating element7.
Sediment or scale build up in tank8.
Increase set point temperature; see “Adjusting 1.
the User Interface Module” section
Clean air filter2.
Change to different mode or modify usage 3.
patterns (For example if in Efficiency Mode
switch to Hybrid Mode)
Ensure the cold connection is at the bottom 4.
and that the hot connection is at the top
Insulate exposed piping5.
Repair hot water leaks6.
Call qualified person for service7.
Drain and flush tank. Water conditioning may 8.
be necessary to minimize build up
HIGH OPERATION COSTS
Temperature set-point too high1.
Air filter dirty2.
Electric mode selected3.
Water connections to unit reversed4.
Heat lost thru long run of exposed 5.
pipe
Hot water leak at faucet or piping6.
Sediment or scale build up in tank7.
Decrease set point temperature; see “Adjusting 1.
the User Interface Module”
Clean air filter2.
Change to Efficiency or Hybrid mode for re-3.
duced energy costs
Ensure the cold connection is at the bottom 4.
and that the hot connection is at the top
Insulate exposed piping5.
Repair hot water leaks6.
Drain and flush tank. Water conditioning may 7.
be required to minimze build up
DRIP FROM TEMPERATURE &
PRESSURE RELIEF VALVE
(Warning: Do not plug or cap
T&P discharge pipe.)
1. Excessive water pressure
2. Add or service a thermal expansion
tank.
3. Non-functioning Temperature &
Pressure Relief Valve
1. Check water supply inlet pressure. If higher
than 80 PSIG, install a pressure reducing
valve
2. See “Closed System/Thermal Expansion” section
3. Replace the Temperature & PressureRelief
Valve
OTHER The water heater does not 1.
immediately start
The heat pump does not run in 2.
Efficiency mode.
The heat pump runs when set to 3.
Electric mode.
When first started the water heater takes about 8 1.
minutes to complete a diagnostic routine
Contact a qualified person for service2.
Contact a qualified person for service3.