COMFORT-AIRE Century VMH-SV Series Service Manual page 141

Check the fastening screws on the
PCB and IPM radiator.
Replace the outdoor
Are they
YES
fixed tightly?
control PCB.
NO
Tighten the screws and apply
silicon grease.
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
 Troubleshooting 
Troubleshooting