Heat Controller VMC24SB-1/VMH24SB-1 Heat Pump User Manual


 
- 60 -
Only for training and service purposes
Part 4 Trouble Shooting
6) Troubleshooting CH24, CH25
CN TRNAS1
CN PRESS
TRANS1
60Hz, DC12V
24
25
Press S/W Open
Input voltage
Low / High press
S/W open.
Abnormal Input voltage
(140VAC or lower 300VAC
or higher).
Check the connection of CN_Press.
Check the components.
Check the power source.
Check the components.
Error
code
Title Cause of error Check point & Normal condition
Check Point
CH 24
1. Check the connection of CN_PRESS
2. Check the installation conditions for over loads.
3. Check that the SVC Valve is open.
4. Check for the leakage of refrigerant.
CH 25
1. Check the power source.
2. Check the components
(Trans1, B/Diode, Diode, Resistance)