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