Huawei FusionModule800 Maintenance Manual page 28

FusionModule800 Smart Small Data Center
Maintenance Guide

You are not advised to maintain or replace outdoor units in rainy days. If unavoidable, take
protective measures to prevent water from entering the outdoor unit.

When opening the electric control box cover, clear water from the cover.

Certain circuits in the air conditioner have lethal voltages. Only professional technicians
are allowed to perform maintenance.

Exercise caution during troubleshooting with power on.

If jumpers are used for troubleshooting, always remove them after troubleshooting.
Connected jumpers may affect control functions and damage equipment.
Table 4-2 Troubleshooting
Cat
ego
ry
Ind
oor
unit
Issue 02 (2016-11-15)
Sympt Possible Cause
om
The The indoor fan is
indoor damaged.
unit
fails to
The connection terminals
start.
for the fans are not
securely connected.
The The electric heater
heating temperature switch is
function protected.
fails.
The electric heater
contactor is not closed.
The electric heater burns
out.
The The water inlet solenoid
humidifi valve fails.
cation
The humidifier pump is
function
faulty.
fails.
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Measure
Replace the indoor fan by following
instructions in 5.3.1.2 Replacing an Indoor
Fan.
Secure the connection terminals.
 Check the temperature switch. If it is
protected due to high temperature, it can
automatically recover after the
temperature drops.
 If the protection fuse has blown, replace
the temperature switch.
Check the electric heater contactor.
Disconnect the power supply and check
whether the heater is damaged by measuring
its resistance with an ohmmeter.
Replace the water inlet solenoid valve.
Replace the humidifier pump by following
instructions in 5.3.1.4 Replacing a
Humidifier Pump.
4 Troubleshooting
22