Lennox ROOFTOP FLEXY FCA Series Installation Operating & Maintenance Manual page 84

Before Calling for Assistence
The unit no longer works
Cause :
- No supply voltage.
- Ruptured remote control fuses.
- Wrong connections.
Solution :
- Check the supply voltage.
- Check the fuses.
- Check and tighten the connections.
The fan rotates but the compressor does not work
Problem :
- The air rerun conditions are not followed.
Cause :
- The control does not engage the compressor(s), a
pressure switch has tripped.
- The drive of the compressor(s) is out of action.
Solution :
- Check the control supply voltage.
- Check the connections.
- Reset the pressure switches (electrical control only).
- Check the compressor supply voltage.
- See previous sections.
Refrigerant fluid level too low
Problem :
- Evaporator partly frozen.
- Low pressure switch cutout.
Cause:
- Refrigerant liquid leak.
Action:
- Search for leaks, repair if necessary and add some
refrigerant liquid.
The electrical heater battery is not powered
Problem :
- Variable temperatures,
Cause :
- One or more fuses are ruptured.
- The safety thermostat is open (temperature is too high
due to insufficient air flow),
Solution :
- Check the electrical supply and fuses.
- Check the ohmic values.
- Reset the safety thermostat and check the air flow (first
section)
IOM / ROOF-TOP FLEXY™ Series - Page 83