20
FAULT DIAGNOSIS FLOW CHART
GLYCOL MODULE (WATER COOLED UNITS)
IS THE
GLYCOL
PUMP
OPERATING
Check for 240v
supply at
connection
Plug pump into
connector
Top up to
maximum level
and check for
leaks
Faulty pump
motor
Internal wiring
fault or faulty
electrical feed
from base unit
Open shut off
valves
System O.K
Possible air lock in
system. Bleed air
lock out of system
and re-prime.
Is the heat dump
sited more than 12m
lift away from the
glycol module
Is the pump
plugged into its
mating connector
No
No
Yes
Yes
Is the glycol level
in the header tank
between Max and
Min marks
No
Yes
No
Is the glycol mixture
recirculating
adequately
Yes
Are the shut off
valves open on the
connections to the
pump
No
No
Yes
Yes
Ensure tubing is the correct
type (Cobracol) and ensure
pipes are not secured
together and are away from
heat sources.
Are the glycol lines
connecting the heat
dump blocked,
collapsed or restricted
in any way.
Clear blockage or
restriction
Yes
No
Is the glycol mixture
recirculating
adequately
System O.K
Yes
Faulty pump
No
No
Re-site heat dump
closer to glycol
module.
Yes
