10
15
CHECK FOR 230V AT
TERMINAL 27
MAIN BURNER NOT OPERATING
IS
PILOT
LIT ?
IS TIME
CONTROL &
THERMISTA-STAT
CORRECTLY
SET ?
IS
GAS
ON ?
N
N
LIGHT
PILOT
Y
Y
SWITCH ON
230 V
N
Y
N
Y
SET CONTROLS
CORRECTLY
DISCONNECT THERMISTA-STAT
AT TERMINALS ‘7’ & ‘8’, LINK
TERMINALS ‘7’ & ‘TEST’
IS 230V
SUPPLY
ON ?
Y
RECONNECT THERMISTA-STAT
AT TERMINALS ‘7’ & ‘8’,
DISCONNECT ON CONNECTION
AT THERMISTA-STAT
DOES
FAN
RUN ?
DOES
FAN
RUN ?
Y
REPLACE
THERMISTA-STAT
N
EXTERNAL WIRING TO
THERMISTA-STAT
FAULTY
CHECK FOR 230V AT
MULTIFUNCTIONAL
CONTROL
N
Y
REPLACE
MULTIFUNCTIONAL
CONTROL
Y
CHECK WIRING TO
MULTIFUNCTIONAL
CONTROL
N
CHECK FOR 230V AT
TERMINAL 15
N
CHECK FOR 230V AT
TERMINAL 13
Y
LINK TERMINALS ‘13’
& ‘14’, IF BURNER
LIGHTS REPLACE
FAN/LIMIT CONTROL
N
CHECK FOR 230V AT
TERMINAL 29
CHECK WIRING
CONNECTIONS
Y
TURN GAS
ON
N
REPLACE
ELECTRONIC
MODULE
Y
CHECK WIRING
CONNECTIONS
Y
N
CHECK FOR 230V AT
CENTRE TERMINAL OF
SWITCH ‘S5’
N
CHECK FOR 230V AT
TIME CONTROL
TERMINAL ‘C5’
REPLACE AIR HEATER
SWITCH
Y
N
REPLACE TIME
CONTROL MECHANISM
8.2
BURNER AND CONTROL ASSEMBLY REMOVAL:
8.2.1
Ensure that the Gas and Electrical supplies are switched OFF
8.2.2
Remove air filter and the appliance door.
8.2.3
Disconnect igniter at the piezo unit.
8.2.4
Disconnect Multifunctional control electrical connections.
8.2.5
Disconnect the gas supply by breaking the union at the input of the Multifunctional control.
8.2.6
Remove the 8 Burner assembly securing screws and withdraw the Burner and Control Assembly.
8.2.7
Refitment or replacement is in reverse order.
8.3
MAIN BURNER REMOVAL:
8.3.1
Remove the Burner and Controls assembly as detailed in 8.2.
8.3.2
Release the 4 x securing screws and withdraw the Main Burner.
8.3.3
Refitment or replacement is in reverse order.
8.4
MAIN INJECTOR REMOVAL:
8.4.1
Remove the Main Burner as detailed in 8.3.
8.4.2
Unscrew the main injector from its holder.
8.4.3
Refitment or replacement is in reverse order.
8.5
PILOT BURNER ASSEMBLY DISMANTLING AND REMOVAL:
8.5.1
Remove Burner and Controls assembly as detailed in 8.2.
8.5.2
Release the Thermocouple lock nut from the Pilot Burner Assembly and Multifunctional Control, and withdraw
the Thermocouple, taking care to avoid damage to the capillary.
8.5.3
Release the Igniter electrode lock nut from the Pilot Assembly and withdraw the electrode.
8.5.4
Disconnect the pilot gas feed pipe from the Multifunctional control and Pilot Assembly.
8.5.5
Withdraw the Pilot injector from the Pilot Assembly.
8.5.6
Release the 2 x screws, nuts and lock washers securing the Pilot Assembly to the Burner and Controls assembly,
and withdraw the Pilot Assembly.
8.5.7
Refitting or replacement is in reverse order, ensuring that the Pilot Assembly gaskets are not damaged and that the
Pilot Assembly firmly seals with the Burner and Controls assembly. DO NOT over tighten the thermocouple
connection at the Multifunctional control, (finger tight plus 1 flat).
8.6
MULTIFUNCTIONAL CONTROL REMOVAL:
8.6.1
Remove the Burner and Controls Assembly as detailed in 8.2
8.6.2
Disconnect the Thermocouple at the Multifunctional control, avoiding damage to the capillary.
8.6.3
Disconnect the Pilot gas feed pipe from the Multifunctional control.
8.6.4
Disconnect the Multifunctional control input and output supply feeds.
8.6.5
Refitting or replacement is in reverse order.
NOTE:
When refitting or replacing the Multifunctional control, the ‘O’ ring seals are to be replaced.
8.7
PIEZO UNIT REMOVAL:
8.7.1
Disconnect the 2 conductors from Piezo unit.
8.7.2
Release the retaining nut and remove the Piezo unit from its mounting bracket.
8.7.3
Refitting or replacement is in reverse order.
8.8
AIR CIRCULATING FAN, REMOVAL AND CLEANING:
8.8.1
Ensure that the electrical supply is isolated.
8.8.2
Remove the appliance front door, release the 2 x securing screws and hinge down the electrical panel.
8.8.3
Disconnect the fan flying lead socket.
8.8.4
Withdraw the fan flying lead from the cable clamp on fan chamber floor.
8.8.5
Release the 2 x Fan Assembly securing screws and withdraw the Fan Assembly from the Heater cabinet, avoiding
damage to the fan blades.
8.8.6
Remove all dust from both the impeller and motor, taking care to not disturb the balance of the fan.
8.8.7
Refitting or replacement is in reverse order.
SYSTEM E-T DEFECT DIAGNOSIS FLOW CHART
