201
26
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. flow switch (38) 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
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. flow switch (38) 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 (63) 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
GENERAL TEST FOR D.H.W. AND CENTRAL HEATING (First check A and B above)
OK FAULT POSSIBLE CAUSE OF FAULT
RL2/RLX energised not energised Wiring defect: check wiring on (66-67-68)
LED 7 1 0 Wiring defect: check wiring on (66-67-68)
LED 8 1 0 - CH limit thermostat (50) open circuit (pump will run)
- DHW limit thermostat (52) open circuit
B
C
A
D
IGNITION OF PILOT
1 Check first A, B and C above
2 Check if Jumper J1 is fitted
3 Push ignition button (60) fully in
4 Microwitch (66) will close
5 Relay RL3 will energise
6 Ignition transformer (67) will energise
7 Check spark and position of spark electrode (24)
LED n° colour signification:
1 green Mains on/low voltage on
2 yellow Domestic hot water flow switch (38) on
3 yellow Central heating room thermostat (72) / clock (62) calling for heat
4 green Sensor (34) or (42) calling for heat
5 red Central Heating waiting time, a max. 3 minutes delay following
shut off Boilerstat (63), Clock (62), Roomstat (72) or use of Hot Water
6 yellow Demand for heat. Relays RL2/RLX energised.
7 green Demand for heat
8 yellow Gas valve (46) energised
RELAYS
RL1 central heating pump
RL2
RL3 ignition
NOTE
If RL1 is not energised the
Central Heating pump will
run
RL not 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
REsistance of Central Heating
or Hot Water sensors
(34) + (42)
10° C 890 ohm
25° C 1000 ohm
60° C 1300 ohm
Jumpers J1 - J2
Fitted Not fitted
J1 Prepurge time before Prepurge time before
ignition = 0 second ignition = 20 second
J1 should
be fitted
General Notes - For use on the
201 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
RL energised
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