Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual page 31

Diagram 25 Electric Boiler Fault Finding
Alarm 2
ALARM TRIPS DURING
SELF CHECKING BUT
NOT INSTANTLY
Diagram 26 Electric Bolier Fault Finding
Alarm 3
ALARM TRIPS AFTER
A FEW MINUTES OF
PUMP RUNNING
OPERATION
THE 3 AMP
PANEL MOUNTED
FUSE BLOWN
PUMP NEON
ON CONTROL PCB
ILLUMINATED
Diagram 27 Electric Boiler Fault Finding
Alarm 4
THE ALARM
ALARM TRIPS
TRIP ON A DAILY
OCCASIONALLY
Alarm Reset
To reset the unit after an ALARM condition:
a. Switch off the electrical supply
b. Correct the fault, check the system is full
of water, is set to the correct pressure and
there is a good flow of water around the
primary circuit.
c. Switch the electrical supply back on.
THERE IS NO WATER
IN THE SYSTEM.
SWITCH OFF
IMMEDIATELY.
CHECK AND REFILL
BEFORE RESTARTING
CHECK FOR A FLOW
RESTRICTION.
YES
IS THE
CHECK THE BYPASS,
ISOLATING AND
RADIATOR VALVES
ARE OPEN. CHECK
FOR AIR IN SYSTEM.
NO
HAS
YES
REPLACE FUSE
NO
IS THE
YES
CHECK AND OPEN
PRIMARY ISOLATING
VALVES.
CHECK AND REPLACE
PUMP
NO
IF THE PUMP NEON
ON CONTROL PCB
DOES NOT
ILLUMINATE WHEN
DEMAND IS
ILLUMINATED REPLACE
THE CONTROL PCB
CHECK FLOW AND
DOES
PRESSURE. CHECK
YES
FOR TEMPORARY
RESTRICTIONS TO
BASIS
FLOW. CHECK
CONNECTIONS TO
OVER-TEMPERATURE
DEVICE CONN 3.
NO
CHANGE CONTROL
PCB
CHECK FLOW AND
PRESSURE. CHECK
FOR TEMPORARY
RESTRICTIONS TO
FLOW. CHECK
CONNECTIONS TO
OVER-TEMPERATURE
DEVICE CONN 3.
RESET.
Diagram 28 Electric Boiler Fault Finding
Demand Faults 1
240V AT THE
DEMAND INDICATOR
ROOM THERMOSTAT
FAULTS
CONNECTIONS
240V BETWEEN
R AND N ON
Diagram 29 Electric Boiler Fault Finding
Demand Faults 2
DEMAND INDICATOR
STILL FLASHING
AFTER 3 MINUTES
Note
There are two different types of status display
PCB's. When replacing them the Underfloor
status display PCB must be used on the Un-
derfloor model, & the Radiator PCB with the
Radiator Model. (see Diagram 39)
Installation & Servicing Instructions
IS THERE
NO
CHECK 3 AMP PANEL
MOUNT FUSE
CHECK PROG. ROOM
IS CALLING FOR HEAT
YES
IS THERE
NO
CHECK WIRING
CONTROL
PCB
YES
NO
NEUTRAL MUST BE
CONNECTED TO N
ON CONTROL
CONNECTOR
YES
REPLACE THE
CONTROL PCB
DOES
NO
CHANGE THE
THE MAIN
CONTROL PCB
RCD TRIP
YES
CHECK THE
INSULATION OF
THE BOILER
ELEMENTS
31