Glow-worm Xtrafast 96-120 - Manual (Page 27)

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17 Fault Finding
CODE CHECK DISPLAY SYMBOL
00
NO FAULT
02
THIS SYMBOL IS NOT INSTANTANEOUS BUT IF IT APPEARS
AFTER 40 SECONDS, CHECK
• THE FLUE SYSTEM FOR A BLOCKAGE, EXCESS LENGTH.
• CHECK THE AIR PRESSURE SWITCH.
• CHECK THE ELECTRICAL CONNECTIONS.
• PUMP BLOCKED OR ITS CONDENSER OUT OF SERVICE.
• ISOLATING COCKS CLOSED ON JIG.
• DEFECTIVE OVERHEAT THERMOSTAT.
• BLEED OUT AIR.
• CHECK THE ELECTRICAL CONNECTIONS.
• SENSOR IN SHORT CIRCUIT OR HAS ISOLATION FAULT.
• CHECK THE ELECTRICAL CONNECTIONS.
THIS FAULT MAY BE INTERMITTENT.
• SWITCH (OFF), WAIT APPROXIMATLEY 5 SECONDS, SWITCH (ON).
• IF FAULT PERSISTS. REPLACE MAIN CONTROL BOARD (PCB).
THIS FAULT MAY BE OCCASIONAL AND CAUSED BY
• ELECTROMAGNETIC INTERFERENCE. OTHERWISE
• CHECK THE MAIN CONTROL BOARD (PCB).
THERE IS DEMAND BY THE ROOM TEMPERATURE THERMOSTAT.
• CHECK THE CONNECTIONS.
IF FAULT PERSISTS, REPLACE MAIN CONTROL BOARD (PCB).
• CHECK HEATING THERMISTOR (MAY BE UNCLIPPED) OR
THREE WAY VALVE FAULTY.
• FAULTY PUMP.
• LOW HEATING FLOW RATE.
• INTERFACE MAY BE DAMP. DRY IT OUT OR REPLACE.
04
IF THE BURNER LIGHTS WITH A TRAIN OF SPARKS
AND GOES OUT AFTER 7 SECONDS.
• REVERSE LIVE AND NEUTRAL TO THE ELECTRICAL PLUG.
• CHECK THE ELECTRODE AND ITS CORRECT CONNECTION.
• CHECK IGNITION BOX.
• CHECK THERE IS MORE THAN 40V BETWEEN LIVE AND EARTH.
IF THE TRAIN OF SPARKS DOES NOT LIGHT THE BURNER, CHECK .
• THE GAS TAP ON THE INSTALLATION IS OPEN.
• THE GAS CONTROL VALVE.
• CHECK THE IGNITON BOX.
• CIRCUITS OPEN OR SHORT CIRCUIT.
• CHECK RESISTANCE OF THE THERMISTOR. (12500 ohms AT
20
° C. 1750 ohms AT 70 ° C).
• UNCLIP THE THERMISTOR FROM THE PIPE, IF THE BOILER
RE-LIGHTS WHEN THE THERMISTOR IS OPEN CIRCUIT.
REPLACE THE THERMISTOR.
05
06
07
or
or
08
09
12
13
14
20
TYPE OF FAULT
NO FAULT
AIR FLOW SAFETY
NO IGNITION
Note: MAX. IGNITION TIME
= 7 SECONDS
OVERHEATING
HEATING THERMISTOR
ON FLOW PIPE
DOMESTIC THERMISTOR
ON DHW PIPE
TEMPERATURE ON
STORAGE VESSEL
LOSS OF WATER
PRESSURE SENSOR.
USER INTERFACE
MAIN CONTROL BOARD
(PCB)
TEMPERATURE LIMITER.
CONTROLLED BY THE
HEATING THERMISTOR
ON FLOW PIPE.
COMMUNICATION FAULT
NO HEATING
WATER NOT HOT ENOUGH,
OR UNEVEN FLOW FROM
TAP. THERE IS A
HOT WATER DEMAND.
• CHECK THAT CONTACT 1 IS ON 1. OR MEASURE A RESISTANCE
< 10 ohms BETWEEN B5.1 AND B5.2.
• CHECK ROOM THERMOSTAT CONNECTIONS OR MEASURE A
RESISTANCE < 50 ohms BETWEEN B3.1 AND B3.2.
NO HEATING.
NO DISPLAY OF
RADIATOR SYMBOL.
• CHECK THREE WAY VALVE.
• CHECK THREE WAY VALVE MOTOR (SWITCHING).
• CHECK THE DIRECTION OF
• CLIP ON THREE WAY VALVE (READABILITY OF SYMBOL ).
• MEASURE THE MICROFAST RESISTANCE = 1000 ohms
BETWEEN H4.1 AND H4.3.
WATER NOT HOT ENOUGH,
OR UNEVEN FLOW FROM
TAP. NO DISPLAY OF
TAP SYMBOL.
• READ THE VALUE OF FLOW RATE DETECTOR ON CODE 07 OF
INFO MENU. IT WILL READ HOT WATER OUTPUT (L/MIN.)(x10)
VALID RANGE 00,,,199 NOTE: DIVIDE THE VALUE BY 10.
IF = 0 THE DETECTOR IS BLOCKED OR FAILED. IF = 0 THE
DETECOR IS BLOCKED OR THE
MAIN CONTROL BOARD (PCB) HAS FAILED.
THE BURNER COMES ON
WHEN COLD WATER
IS DRAWN OFF.
• CHECK THAT THE HOT WATER CIRCUIT HAS BEEN BLED
PROPERLY (ANY AIR BUFFER MAY ACTIVATE THE FLOW RATE
DETECTOR WHEN THE TAPS ARE TURNED ON).
O
K
R
OTHER FAULTS NOT DISPLAYED BY FAULT CODE
TO AID FAULT FINDING REFER TO DIAGRAMS 5.1 AND 18.1.