© MHG Heating Ltd
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MHG Heating Ltd Unit 4 Epsom Dow ns Metro Centre, Waterfield, Tadw orth, Surrey KT20 5LR
Telephone 01737 358000 Fax 08456 448803 Email
Web w w w .mhgheating.co.uk
010717
10.3 Controller Error Codes
Code
Description
10
Outside temperature, sensor error
20
Boiler temperature 1, sensor error
26
Common flow temperature, sensor error
28
Flue gas temperature, sensor error
30
Flow temperature 1, sensor error
32
Flow temperature 2, sensor error
38
Flow temperature, primary controller, sensor error
40
Return temperature 1, sensor error
46
Cascade return temperature, sensor error
47
Common return temperature, sensor error
50
DHW temperature 1 sensor error
52
DHW temperature 2 sensor error
54
Flow temperature DHW, sensor error
57
DHW, circulation sensor error
60
Room temperature 1, sensor error
65
Room temperature 2, sensor error
68
Room temperature 3, sensor error
70
Storage tank temperature 1 (top), sensor error
71
Storage tank temperature 2 (bottom), sensor error
72
Storage tank temperature 3 (center), sensor error
78
Water pressure, sensor error
81
LPB short circuit or no bus power supply
82
LPB address collision
83
BSB wire cross-sectional/no communication
84
BSB wire address collision
85
BSB RF communication error
91
Data overrun in EEPROM
98
Extension module 1, error
99
Extension module 2, error
100
2 clock time masters
102
Clock time master without backup
103
Communication error
105
Maintenance message
109
Supervision boiler temperature
110
STB (SLT) lockout
111
Temperature limiter safety shutdown
117
Water pressure too high
118
Water pressure too low
119
Water pressure switch has cut out
121
Flow temperature heating circuit 1 not reached
122
Flow temperature heating circuit 2 not reached
125
Maximum boiler temperature exceeded
126
DHW charging temperature not reached
127
DHW legionella temperature not reached
128
Loss of flame during operation
129
Wrong air supply
130
Flue gas temperature limit exceeded
132
Gas pressure switch safety shutdown
