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(307IO) MODEL HP3220 HEAT PUMP ENGLISH 7.5” X 10.3” PANTONE 295U 10/10/2017
English
307
IO
SAVE THESE INSTRUCTIONS
English
Page 19
SERVICE BY QUALIFIED TECHNICIANS (continued)
LED Display Error Code
ERROR CODE
SHOWN ON LED
DISPLAY
CAUSE
SOLUTION
• Frost on evaporator fins: ambient
air temperature is lower than the
minimum operating air temperature
range 8 °C.
• Ambient air temperature sensor
broken.
• Check ambient air temperature variation, specially from
day time to mid-night. Wait until ambient air temperature
rises to start the heat pump.
• Switch off unit for few minutes and switch on again,
check if: a) fan is not running, replace damaged fan
motor. b) fan is running, then make sure adequate air
circulation, see “Location and Space Requirement”
section.
• Check T2 temperature sensor connection.
• T2 temperature sensor broken, replace T2 sensor.
• Terminal block for T2 connection on PCB broken, replace
PCB.
• Water in temperature sensor broken.
• Check T5 temperature sensor connection.
• T5 temperature sensor broken, replace T5 sensor.
• Terminal block for T5 connection on PCB broken, replace
PCB.
• Water out temperature sensor
broken.
• Check T4 temperature sensor connection.
• T4 temperature sensor broken, replace T4 sensor.
• Terminal block for T4 connection on PCB broken, replace
PCB.
• Evaporator fins temperature sensor
broken.
• Check T3 temperature sensor connection, replace T3
sensor.
• T3 temperature sensor broken.
• Terminal block for T3 connection on PCB broken, replace
PCB.
• Gas return temperature sensor
failure.
• Check T1 temperature sensor connection, replace T1
sensor.
• T1 temperature sensor broken.
• Terminal block for T1 connection on PCB broken, replace
PCB.
• Coil temperature sensor failure.
• Check T6 temperature sensor connection, replace T6
sensor.
• T6 temperature sensor broken.
• Terminal block for T6 connection on PCB broken, replace
PCB.
• High pressure protection
• Check bypass valves setting
• Check system water flow is according to “Product
Specification” section.
• Check high pressure sensor connection.
• High pressure sensor broken, replace it.
• Terminal block for high pressure sensor connection on
PCB broken, replace PCB.