Daikin EWAD620-C17C-SS, Service Manual

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ESIE10-01 Troubleshooting Chart
Part 3 – Troubleshooting 3–77
3
3
4
5
1
Compressor
overload relay
tripped or circuit
breaker trip or
fuses blown
1 There is low voltage during high
load condition. 1 Check the supply voltage for
excessive voltage drop.
2 There is loose power wiring. 2 Check and tighten all
connections.
3 There is a power line fault
causing unbalanced voltage. 3 Check the supply voltage.
4 There is defective or grounded
wiring in the motor. 4 Check the motor and replace if
defective.
5 There is high discharge
pressure. 5 See corrective steps for high
discharge pressure.
Compressor
noisy or
vibrating
1 There is a compressor internal
problem. 1 Contact Daikin.
2 The oil injection is not adequate. 2 Contact Daikin.
Compressor will
not load or
unload
1 The capacity control is defective. 1 See capacity control section.
2 The unloader mechanism is
defective. 2 Replace.
3 The control solenoids are
defective. 3 Replace.
High discharge
pressure
1 Discharge shut-off valve is
partially closed. 1 Open the shut-off valve.
2 Non condensable is in the
system. 2 Purge the non-condensable from
the condenser coil after
shutdown.
3 Fans are not running. 3 Check the fan fuses and
electrical circuits.
4 Fan control is out of adjustment. 4 Check if the unit set-up in the
microprocessor matches the unit
model number. Check the
microprocessor condenser
pressure sensor for proper
operation.
5 Heat recovery condensers are
dirty. 5 Clean the condenser tubes by
mechanical or chemical tools.
6 System is overcharged with
refrigerant. 6 Check for excessive sub-cooling.
Remove the excess charge.
7 The condenser coil is dusty. 7 Clean the condenser coil.
8 The air recirculates from the
outlet into the unit coils. 8 Remove the cause of
recirculation.
9 Air entering the unit is restricted. 9 Remove any obstructions near
the unit.