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1001
30
General Notes - For use on the 1001 fitted with VMF7 Printed Circuit Board
*The central heating pump (32) will run to disperse heat if the temperature at the heat exchanger limit thermostat (50) is too high
*The frost thermostat (51) will switch on the boiler for central heating if the temperature is too low.
*Fuse on P.C.B.: 2 Amp.
LED n° signification:
1 Mains on/low voltage on
2 Flowmeter (136) on
3 Central heating room thermostat (72) / clock (62) calling
4 Sensor (34) or (42) calling for heat
5 Central Heating waiting time, max. 3 minutes delay following shut off
Boilerstat (63), Clock (62), Roomstat (72) or use of Hot Water
6 Demand for heat - relay (RY2) will be energised
7 Air pressure switch (43) on, air flow checked
Jumpers JP1 - JP4
Fitted Not fitted
JP1 No waiting time Waiting time on
JP4 Fan control Fan control
High & Low speed High speed only/off
temp. Ohm
10° C 890 ohm
25° C 1000 ohm
60° C 1300 ohm
80°C 1490 ohm
Temp.
sensor
RY not energised RELAY RY
RY1 central heating pump
RY2 on/off relay
RY3 -
RY4 fan
Note
If RY1 is not energised
the Central Heating pump
will run
RY energised
Check operation using LED's as a fault finding guide. First check section A, then B, then C, then D.
0 = LED off 1 = LED on x = LED either on/off is not important
GENERAL TEST FOR D.H.W. AND CENTRAL HEATING (First check A and B above)
LED/REL. OK FAULT POSSIBLE CAUSE OF FAULT
RY2 energised not energised Check first A and B above
RY4 energised not energised Air pressure switch (43) not in NC position or miswired:
- check wiring
- fan (16) at low speed remove jumper JP4
7 1 0 - fan (16) not running at full speed or
- air flow too low:
- air pressure switch (43) faulty
B
CENTRAL HEATING ON Room stat (72) at Max, HW tap closed
LED OK FAULT POSSIBLE CAUSE OF FAULT
1 1 0 No main electricity/switches off, fuse blown.
2 0 1 Hot water tap open - D.H.W. flowmeter (136) contact closed
3 1 0 Roomstat (72) or clock (62) not calling for heat
4 1 0 - Central heating sensor (34) not connected or
- boiler temperature too high or
- boiler thermostat (61) below CH temperature
5 0 1 Waiting time still operating (max. 3 minutes)
6 1 0 - C.H. sensor (34) short circuit or resistance lower than 500 ohm
- C.H. limit thermostat (50) open circuit (pump will run)
- C.H. water pressure low (114 open circuit)
Domestic Hot water tap open (Flow rate greater than 2,5 l/min)
LED OK FAULT POSSIBLE CAUSE OF FAULT
1 1 0 No mains electricity/switches off/fuse blown.
2 1 0 D.H.W. flowmeter (136) not operating.
3 X X Not required for D.H.W.
4 1 0 - D.H.W. sensor (42) not connected or D.H.W. temperature too high
5 0 1 - Waiting time operating: replace P.C.B.
6 1 0 Short circuit on D.H.W. sensor (42) or resistance lower than 500 Ohm
- C.H. limit thermostat (50) open circuit (pump run)
- C.H. water pressure low (114 open circuit)
A
IGNITION OF BURNER (AUTOMATIC IGNITION)
1 Fan (16) should run at full speed (open hot tap or set controls
so boiler is calling for heat).
2 Check first A, B and C above (LED 6 is ON?)
3 Check spark and position of spark electrode (81)
4 Check position of flame sensing electrode (82)
5 Check burner gas pressure during ignition
C
D