IDEAL IMAX XTRA E320 Installation And Servicing page 54

MASTER AND SLAVE BOILER CONTROL MODULE BLOCKING CODES
Code Description
08 Air Pressure Switch did not close
18 Flow temperature too high
19 Return temperature too high
24 Return temperature > Flow temperature for excessive time
25 Flow temperature rise too fast
28 No tacho signal from fan
29 Incorrect tacho signal from fan
30 Flow/return temperature differential too high
33 Tank sensor short circuit
35 Flue thermistor short circuit
38 Tank sensor open circuit
40 Flue thermistor open circuit
43 Parameter values in EEPROM values out of range
52 Flue gas temperature too high
65 Fanspeed during start not within the dead band
109 Heat exchanger temperature too high
116 Mains frequency deviation > 1.5Hz or processor oscillator error If mains supply frequency OK replace control module.
118 Flame current lost during burner on
71 TECHNICAL CHARACTERISTICS - TEMPERATURE SENSORS
The table below gives the relationship between temperature and resistance for the following sensors; flow thermistor, return
thermistor, flue thermistor, heat exchanger thermistor, outside temperature sensor and DHW tank sensor.
Temperature in
o
10
20
30
40
50
54
FAULT FINDING
C Resistance in ohm
22,800
14,700
9,800
6,650
4,610
Action
Check motorised damper operating
Check air damper is opening
Check flue for blockage
Check/clean burner
Check Air Pressure Switch sensing pipes
condition
Check fan speed
Check air Pressure Switch & replace if
necessary
Check no air in system or boiler
Check adequate flow of water through boiler
Check no air in system or boiler
Check adequate flow of water through boiler
Check no air in system or boiler
Check adequate flow of water through boiler
Check no air in system or boiler
Check adequate flow of water through boiler
Check wiring to fan
If wiring OK replace fan
Check wiring to fan. If wiring OK replace fan.
Check no air in system or boiler
Check adequate flow of water through boiler
Not fitted check parameter 46 settings
Check wiring
Disconnect terminals from thermistor &
confirm short circuit using meter
Replace thermistor
Not fitted check parameter 46 settings
Check wiring
Disconnect terminals from
thermistor & confirm open circuit using meter
Replace thermistor
Replace control module.
Check no air in system or boiler
Check adequate flow of water through boiler
Check wiring to fan. If wiring OK replace fan.
Check no air in system or boiler
Check adequate flow of water through boiler
Check wiring
Check condition of ignition/detection
electrode & replace if necessary
Temperature in C Resistance in ohm
o
60
70
80
90
100
IMAX XTRA -
32,250
2,340
1,710
1,260
950
Installation & Servicing