Univex EPX-80DHPT - Manual (Page 17)

17
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 heater 2.
Unit in standby 3.
Unit in Vacation mode 4.
High temperature limit switch open 5.
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 on 3.
Select mode other than Vacation 4.
Reset the high temperature limit switch; see 5.
“Safety shut-off” section for more information
Contact a qualified person for service 6.
INSUFFICIENT HOT WATER/
SLOW HOT WATER
RECOVERY Temperature set-point too low 1.
Air filter dirty 2.
Hot water usage pattern exceeds the 3.
capability of the water heater in
current mode
Water connections to unit reversed 4.
Heat lost through long run of exposed 5.
pipe
Hot water leak at faucet or piping 6.
Non-functioning heating element 7.
Sediment or scale build up in tank 8.
Increase set point temperature; see “Adjusting 1.
the User Interface Module” section
Clean air filter 2.
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 piping 5.
Repair hot water leaks 6.
Call qualified person for service 7.
Drain and flush tank. Water conditioning may 8.
be necessary to minimize build up
HIGH OPERATION COSTS Temperature set-point too high 1.
Air filter dirty 2.
Electric mode selected 3.
Water connections to unit reversed 4.
Heat lost thru long run of exposed 5.
pipe
Hot water leak at faucet or piping 6.
Sediment or scale build up in tank 7.
Decrease set point temperature; see “Adjusting 1.
the User Interface Module”
Clean air filter 2.
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 piping 5.
Repair hot water leaks 6.
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 service 2.
Contact a qualified person for service 3.