Fault Finding And Servicing; Fault Finding - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

9.0 Fault Finding and Servicing

9.1 Fault Finding

The fault finding diagrams can be used to
diagnose problems with the Electromax
unit. These checks should be carried out
by a competent installer or an authorized
Heatrae Sadia service engineer or agent. A
range of replacement parts (see Section 9.2)
is available should any major component
be suspected as faulty. The instructions in
Section 9.2 detail how to remove and replace
key components and assemblies. Observe
all safety warnings before removing any
components, if in doubt contact Heatrae
Sadia for further advice.
Diagram 22 Electric Boiler Fault Finding
Master
ELECTRIC BOILER
NOT WORKING
NOTE:
DO NOT CHECK ELEMENT
RESISTANCE WITH POWER
ON
30 Installation & Servicing Instructions
IS CH
GO TO SUPPLY
NO
SWITCH ON
FAULT FINDING
& ILLUMINATED
SECTION
YES
IS THE
GO TO ALARM
ALARM STATUS YES
FAULT FINDING
INDICATOR
SECTION
ILLUMINATED
NO
IS THE
GO TO DEMAND
NO
DEMAND STATUS
INDICATOR FAULT
INDICATOR
FINDING SECTION
FLASHING
YES
DOES
THE DEMAND
GO TO DEMAND
NO
INDICATOR STOP
INDICATOR FAULT
FLASHING AFTER
FINDING SECTION
3 MINS
YES
NO
CHECK FOR PRIMARY
WATER FLOW
YES
CHANGE MAIN
NO
PCB
YES
CHECK EACH BOILER
ELEMENT IS APPROX.
19 OHMS
Diagram 23 Electric Boiler Fault Finding
Supply Faults
BOILER ELECTRICAL
SUPPLY AT 24
SUPPLY FAULT
HOUR & 45 AMP
FINDING
TERMINALS
DOES THE
CH ON SWITCH
ILLUMINATE WHEN
IS THERE
8V DC ON
C1 ON CONTROL
Diagram 24 Electric Boiler Fault Finding
Alarm 1
ALARM TRIPS ON
IS THE
POWER UP. BOTH
BOILER HOT
DEMAND AND ALARM
INDICATORS ARE RED
IS THE
PUMP
RUNNING
THE 3 AMP
PANEL MOUNTED
FUSE BLOWN
CONN 3
OPEN CIRCUIT
IS 240V
NO
CHECK ELECTRICAL
SUPPLIES
YES
NO
CHECK SWITCH
ON
YES
CHECK FOR SHORT
NO
CIRCUITS. IF OK
REPLACE FUSE FS 1
YES
NO
REPLACE THE
CONTROL PCB
PCB
YES
REPLACE THE
STATUS DISPLAY PCB
NO
YES
YES RUN SYSTEM IN
ALARM MODE TO
ALLOW PUMP TO
COOL SYSTEM
BEFORE RESETTING
NO
HAS
YES
REPLACE FUSE
NO
CHECK SERVICE
NO
VALVES ARE OPEN.
CHECK AND REPLACE
PUMP
YES
REPLACE THE
CONTROL PCB
THERE IS NO WATER
IS
IN THE SYSTEM.
NO
SWITCH OFF
IMMEDIATELY.
CHECK AND REFILL
BEFORE RESTARTING
YES
CHECK AND REPLACE
THE OVER-
TEMPERATURE
SWITCH CONN 3