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TROUBLESHOOTING CHART
PROBLEM
NO HOT WATER
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
POSSIBLE CAUSE(S)
1.
Hot water usage pattern exceeds the
capability of the water heater in
current mode
2.
No power to the water heater
3.
Unit in standby
4.
Unit in Vacation mode
5.
High temperature limit switch open
6.
Non-functioning upper temperature
sensor
1.
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.
Temperature set-point too high
2.
Air filter dirty
3.
Electric mode selected
4.
Water connections to unit reversed
5.
Heat lost thru long run of exposed
pipe
6.
Hot water leak at faucet or piping
7.
Sediment or scale build up in tank
1.
Excessive water pressure
2.
Add or service a thermal expansion
tank.
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.
3.
The heat pump runs when set to
Electric mode.
CORRECTIVE ACTION
1.
Change to different mode or modify usage
patterns
2.
Check for blown fuse or tripped breaker.
Restore power to unit then press power button.
3.
Press the power button to turn the unit on
4.
Select mode other than Vacation
5.
Reset the high temperature limit switch; see
"Safety shut-off" section for more information
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 "Adjusting
the User Interface Module"
2.
Clean air filter
3.
Change to Efficiency or Hybrid mode for re-
duced 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. If higher
than 80 PSIG, install a pressure reducing
valve
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 a qualified person for service
3.
Contact a qualified person for service
17
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