Faultfinding; Introduction - Dantherm DanX AF Series User Manual

6. FAULTFINDING

6. F aultfi ndi ng

6.1 Introduction

Normally a fault of the unit will be shown in the display of the electric panel. Depending on
which panel has been delivered these alarm messages can be called differently. Please
refer to the manual of the electric panel for more details. If the frequency inverter for the
fan is showing an alarm, please refer to the manual of the frequency inverter.
6.2 Fault finding
Function
Fan fault
(red LED)
Fan not
running
(no red LED)
Compressor
fault
(red LED)
Compressor
not running
(no red LED)
Problem Cause
• Fan motor broken
• Phase missing
Thermo relay
• Fan belt broken
switched off
• Thermo relay broken
Fire thermostat
• Supply air over 40°C
(accessory) has
switched off
Frost thermostat
• Coil off temperature
(accessory) has
below 5°C
switched off
• Air volume too small
• Blockage in cooling
HP pressure over
circuit
24 bar
• Temperature too high
• Solenoid valve not open
• Leakage in the cooling
LP pressure under
circuit
1.5 bar
• Evaporator iced up
• Fan motor broken
Flow guard
• Phase missing
(accessory)
• Fan belt broken
activated
• Thermo relay broken
• Compressor broken
Thermo relay
• Phase missing
switched off
• Thermo relay broken
23
Action
• Change/Repair motor
• Connect all phases correct
• Change belt
• Change thermo relay
• Check supply air
temperature
• Check LPHW valve
• Check hot water
• Check air volume
• Check/Repair cooling
circuit
• Reset pressure switch
• Check/Repair valve
• Repair cooling circuit
• Deice evaporator/Check
de-icing function
• Change/Repair motor
• Connect all phases correct
• Change belt
• Change thermo relay
• Change compressor
• Connect all phases correct
• Change thermo relay