Space Pak SIS Series, Manual, Page: 39 / 44

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Split Inverter Air-to-Water Heat Pump
Maintenance/Troubleshooting
Faults Query
Display Corresponding
Status Display Fault
Cause Troubleshooting Corrective Action
P01 01 Return Water Temp
Sensor Fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P02 02 Supply Water Temp
Sensor Fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P03 05 Coil Temperature
Sensor Fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P04 04 Ambient Temp
Sensor Fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P07 05 Suction Temp
Sensor Fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P08 03 Discharge Temp
Sensor Fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P11 07 EVI Inlet Temp
Sensor fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
P12 08 EVI Outlet Temp
Sensor fault
Failed or Disconnected
Sensor
Check wiring, check sensor for
open or shorted condition
Repair wiring or replace sensor
E01 - High Pressure
safety switch
Discharge Pressure too
High
Switch opens on fault, closes when
pressure returns to normal
Determine and address cause of
High Pressure
Switch failed or
disconnected
Circuit does not close when
pressure returns to normal
Repair wiring or replace switch
E02 - Low Pressure safety
switch
Suction Pressure too
Low
Switch opens on fault, closes when
pressure returns to normal
Determine and address cause of
Low Pressure
Switch failed or
disconnected
Circuit does not close when
pressure returns to normal
Repair wiring or replace switch
E03 - Flow Switch Insufficient Water Flow Check pump size and operation,
remove air from the system
Purge air and provide sufficient
water flow
Switch failed or
disconnected
Confirm switch closes when flow is
correct. Check wiring
Repair wiring or replace switch
E19 19 Indoor plumbing
freeze protection,
Class 1
Indoor plumbing near or
below freezing
Normal protection, indoor module
should be protected from freezing
protection.
Locate the Indoor module where
it is not exposed to freezing
temperatures.
E20 19 Indoor plumbing
freeze protection,
Class 2
Indoor plumbing near or
below freezing
Normal protection, indoor module
should be protected from freezing
protection.
Locate the Indoor module where
it is not exposed to freezing
temperatures.
E07
P81
Compressor
Overload
E44 04 Outdoor Ambient
Temp too low
Temp below A01
setpoint
Normal protection. Unit will not run
at extreme cold temperatures.
Operate unit when outdoor temp
is above A01. Otherwise engage
backup heat source.
E21 - Input Power under
voltage
Voltage drops too low
under load
Measure Line to Line voltage at the
unit, should not drop below 220V at
full load.
Ensure power supply and
conductors are capable of
delivering sufficient power. Install
a Buck/Boost transformer if supply
cannot maintain 220V.
E22 - Overcurrent
Protection Alarm
Unit drawing too much
current
Measure Outdoor Module current.
Should not exceed 40A
Ensure sufficient indoor water
flow in Heating. Ensure sufficient
outdoor airflow in Cooling.
E23 - Overcurrent
Protection
Shutdown
Unit drawing too much
current
Measure Outdoor Module current.
Should not exceed 40A
Ensure sufficient indoor water
flow in Heating. Ensure sufficient
outdoor airflow in Cooling.
E24 - DC Bus overvoltage
protection
Electronic control fault Contact Technical Support Replace faulty control component
E25 - DC Bus
undervoltage
protection
Electronic control fault Contact Technical Support Replace faulty control component