Delta MCS-1800 Service Manual Page 43
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© MHG Heating Ltd
43
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 08456 448802 Fax 08456 448803 Email info@mhgheating.co.uk Web www.mhgheating.co.uk
020315 Draft
Appliance Fault Codes
The display will read as _:__. The first digit identifies the boiler module at fault.
The figures after the : are the fault codes detailed below.
THETA Code
Reset
Description
Effect
3
Manual
Intervention of the water safety
thermostat
The burner turns off and the circulating pump operates at maximum
speed. The lock-out disappears and the regulator resets when the
temperature detected by the water safety thermostat falls below the
temperature limit
4
Manual
The ionization electrode does not detect a
flame
The flame control board goes into lock-out
5
Manual
The ionization electrode does not detect
the flame during operation of the burner
The ignition is repeated
6
Automatic
Maximum delivery temperature exceeded
The burner turns off and the circulating pump remains in operation
10
Manual
Internal error
The ignition of the burner is impeded
11
Manual
The ionization electrode has detected a
flame before the burner has turned on
The ignition of the burner is impeded
12
Automatic
The delivery temperature sensor is
interrupted or not working
The burner turns off
14
Automatic
The return temperature sensor is
interrupted or not working
The burner turns off
15
Automatic
Protection for reaching the maximum
Delta T permitted between delivery and
return temperatures.
The burner turns off and the circulating pump remains in operation
16
Automatic
Antifreeze function
The circulating pump operates for 5 minutes at maximum speed to
withdraw heat from the system
20
Manual
The ionization electrode detects the flame
after the burner has turned off
The ignition of the burner is impeded
21
Manual
The combustion fan has broken and the
Non Return valve has locked open
The ignition of the burner is impeded
24
Automatic/M
anual
Electric fan speed out of control
The ignition is repeated when the fan speed is equal to +/-10% of that
required or it attempts to start immediately by pressing the reset button
25
Manual
The fume safety thermostat has been
interrupted
The burner turns off. The burner is reactivated using the RESET button
after the temperature of the flue has fallen below the limit
26
Automatic
Combustion fan does not stop
The ignition of the burner is impeded
29
Manual
The condensate syphon/drain is blocked
The ignition of the burner is impeded
30
Manual
The service settings are disturbed by
electromagnetic interference
The ignition of the burner is impeded
31
Manual
Safety parameters errors
The ignition of the burner is impeded
32
Automatic
The power supply is lower than 190Vac
The burner ignition procedure waits until the supply voltage is greater
than 200Vac
38
Manual
The factory settings are disturbed by
electromagnetic interference
The ignition of the burner is impeded
40
Automatic
An insufficient circulation of water has
been detected after 10 seconds of start up
The burner turns off
41
Automatic
Presence of air in the circulating pump
None
42
Automatic
The circulating pump is blocked
Circulating pump and burner turn off
43
Automatic
Circulating pump wiring defective
The burner turns off
56
Automatic
Communication interrupted with one or
more thermal modules
The ignition of the burner is impeded. The error received from the
cascade eBus is not detected by the local eBus: this action leads to the
blocking of the entire cascade
57
Automatic
Communication interrupted with one or
more thermal module burners
The ignition of the burner is impeded. The error received from the local
eBus is not detected by the local eBus: this action leads to the blocking of
the entire cascade
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