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TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
Cooler in fault.
Cooler fails to start/
No power to cooler.
not running.
Wall control in 7-day program mode.
Cooler not receiving commands.
Cooler running in vent mode.
Incorrect wall control temperature setpoint.
Clogged or dirty inlet air filters
Clogged or dirty heat exchanger cores.
Water pump failure.
Pumps run but insufficient water in tank.
Inadequate cooling.
Pumps run but no water circulation or heat exchanger cores
lack water
Inadequate exhaust from building.
Under-sized ducts.
Under-sized cooler.
High ambient humidity.
Excessive humidity.
Inadequate exhaust from building.
Fans out of balance due to dirt, etc.
Noisy cooler.
Air duct noise
New heat exchanger cores.
Cooler located near source of unpleasant odour.
Unpleasant odour.
Algae in reservoir water.
Cores remain wet after shutdown.
Loose water hose connections.
Blocked or undersized drains.
External water leaks.
Excessive amounts of water from drain hose.
Clogged or dirty heat exchanger cores.
Water carryover in
New heat exchanger cores.
supply airstream.
Heat exchanger cores not fitted correctly into plenum.
Water carryover in
External static pressure too high.
exhaust airstream.
SUGGESTED REMEDY
Clear active faults.
Check wall controller fault code log.
Check tri-colour LED for fault code.
Check circuit breaker.
Consult with building manager.
Adjust setpoint and/or timer settings.
Switch to manual mode to check fan operation.
Complete wall controller installation process.
Turn to cool mode.
Adjust wall control setpoint.
Move wall control to more appropriate location.
Clean or replace air filters.
Clean or replace cores.
Check all pumps are operating.
Clean or replace water probe.
Check water management probe position relative to drain valve overflow
Check cooler is level.
Clean pump strainer.
Check water distribution system for possible obstruction in hoses.
Check for blockages in the spreaders feeding the core assemblies.
Make sure there is adequate provision for exhausting air from building (open
windows and doors).
Carry out cooling load design to determine correct size unit, ducting and
outlets required. Discuss with building manager.
On days during summer when ambient humidity is high the cooler will not
reduce the temperature as much as on drier days. There is no remedy.
Make sure there is adequate provision for exhausting air from building (open
windows and doors).
Clean the fans.
Increase size of ducts. Increase size of room registers/grilles
See Commissioning Section for Cooling Core Flush
Remove source of odour or relocate cooler.
Drain reservoir, clean thoroughly with strong cleansing agent, refill.
Run cooler on VENT mode after cooling cycle to dry heat exchanger cores
out.
Check and tighten connections.
Check and clean drain lines.
Check drain valve seal.
Check water management probe position relative to drain valve overflow.
Check cooler is level.
Clean or replace cores.
See Commissioning section for Cooling Core Flush
Check for airgaps around water spreaders and between cores.
Increase size of ducts. Increase size of room registers/grilles.
859741-L CW3 INSTALLATION MANUAL
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