9
Sales/Spares & Replacement Help Line 01604 752881
FAN NOT OPERATING WHEN PIPE IS ABOVE 60°C
NO
YES
YES
YES
NO
YES
NO
NO
YES
NO
NO
Is there and external clock fitted or external mains room stat fitted?
Is there and external clock fitted or external mains room stat fitted?
Check for mains going into fan plug
There must be a link between high voltage terminals 1 & 6 and high
voltage terminals 3 & 6. Make sure both links are present
There must be a link between
High Voltage
terminals 1 & 6 and high
voltage terminals 3 & 6. Make sure both links are present
Measure DC voltage (0 to 10V) within Low Voltage fan connector
(blue & yellow)
Make sure mains is present across high voltage terminals 1 & 2
and 3 & 4
Make sure mains is present across High Voltage terminals 1 & 2
and 2 & 3
Is measured voltage greater than 2V?
Check pipe and connections.
If sound, isolate from mains &
measure resistance across plug
J2 pins 5 & 6
Does the actual pipe temp.
match the approx. pipe temp.
for the measured voltage in
Table A?
Is measured resistance greater
than 11K?
Faulty fan
Faulty PCB
Check sensor is fitted correctly. If
it is then replace sensor.
Faulty PCB
PCB is not seeing sensor.
Confirm by measuring
sensor resistance. Replace
sensor if resistance is greater
then 28K.
YES
YES
NO
In there 230 ~ 250 VAC across high voltage terminals 1 & 2?
If there 230 ~ 250 VAC across High Voltage terminals 1 & 2?
Make sure mains is present across High Voltage terminals 2 & 3
Is the MAF stat connected?
Is fan now running?
Link out low voltage terminals 3 & 4.
Measure voltage across Low Voltage terminals 5 & 6
Is measured voltage greater than 4.7V DC?
Make sure clock or room stat supplies mains voltage to high voltage
terminals 1 & 2. No mains - no fan operation (except for summer vent)
DC VOLTAGE ACROSS
PIPE SENSOR
APPROX. PIPE TEMP. °C DC VOLTAGE ACROSS
PIPE SENSOR
APPROX. PIPE TEMP. °C DC VOLTAGE ACROSS
PIPE SENSOR
APPROX. PIPE TEMP. °C DC VOLTAGE ACROSS
PIPE SENSOR
APPROX. PIPE TEMP. °C
3.24
10
2.13
33
1.26
56
0.73
79
3.19
11
2.08
34
1.23
57
0.71
80
3.14
12
2.04
35
1.20
58
0.70
81
3.09
13
1.99
36
1.17
59
0.68
82
3.04
14
1.95
37
1.15
60
0.66
83
2.99
15
1.91
38
1.12
61
0.65
84
2.94
16
1.87
39
1.09
62
0.63
85
2.89
17
1.83
40
1.07
63
0.63
86
2.84
18
1.79
41
1.04
64
0.60
87
2.79
19
1.75
42
1.02
65
0.59
88
2.75
20
1.71
43
0.99
66
0.58
89
2.70
21
1.67
44
0.97
67
0.56
90
2.65
22
1.63
45
0.95
68
0.55
91
2.60
23
1.59
46
0.92
69
0.54
92
2.55
24
1.56
47
0.90
70
0.53
93
2.50
25
1.52
48
0.88
71
0.51
94
2.45
26
1.49
49
0.86
72
0.50
95
2.40
27
1.45
50
0.84
73
0.49
96
2.36
28
1.42
51
0.82
74
0.48
97
2.31
29
1.39
52
0.80
75
0.47
98
2.26
30
1.35
53
0.78
76
0.46
99
2.22
31
1.32
54
0.76
77
0.45
100
2.17
32
1.29
55
0.75
78
TABLE A
