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Heat Pump Troubleshooting
Table 15. KRIWAN flash codes
Error Category
Motor temperature
General
Phase Monitor Protection
If the heat pump fails to power up, eliminate electrical
phase issues by inspecting the phase monitor device
located in the power distribution panel.
When all voltages are acceptable and the phase sequence
is correct the output relay is energized and the LED glows
green. Under-voltages and unbalanced voltages must be
sensed for a continuous trip delay period before the relay
de-energizes. Reset is automatic upon correction of the
fault condition. The output relay will not energize if a fault
condition is sensed as power is applied. The LED flashes
red during the trip delay, then glows red when the output
de-energizes. The LED flashes green/red if phase reversal
is sensed.
Table 16. LED phase monitor diagnostic codes
LED Display
1. Symptom: Compressor will not start
Possible Causes
Temperature control not in demand
Flow switch open due to low water flow
Low pressure, high pressure sensor open
64
st
1
Flashing Sequence (red LED)
1
3
Indication
Glowing green: All voltages are
acceptable and phase sequence is
correct.
Flashing red: Trip delay prior to
de-energizing. Glowing red:
Output has been de-energized
upon fault detection.
Flashing red and green: Phase
reversal is detected.
No power to phase monitor.
nd
2
Flashing Sequence (orange
LED)
1
2
3
4
5
1
5
If the phase monitor fails to energize (the LED glows red)
check wiring of all three phases, voltage, and phase
sequence. If phase sequence is incorrect, the LED flashes
green/red. To correct this, swap any two line voltage
connections at the mounting socket. No further adjustment
should be required.
Symptoms and Solutions
This section lists the most common troubleshooting
symptoms and the closest potential solution for each. This
is not an exhaustive listing of all potential causes or
resolutions, but represents the best direction in which to
initiate a solution.
Note: An anti-short cycle timer is included in the primary
microprocessor controller to prevent the
compressors from starting until the delay has
elapsed. The microprocessor also provides
minimum compressor run timers. Take these fixed
timer parameters into consideration when
conducting a fault isolation process.
Potential Solutions
Check setpoint.
Check flow switch functionality; check flow rate.
Low/high pressure event has occurred; obstructed BPHE or coil; check fan
settings and functionality; check sensor functionality.
Error Status
Nominal response temperature of
motor was exceeded
Switch off due to blocked rotor
Time delay active after motor
temperature default
Sensor fault motor PTC
Time delay active after blocked rotor
Module undervoltage
Time delay active, category general
ARTC-SVX009A-EN
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