43
Installation and maintenance instructions ecoCRAFT 0020055744_08
9.3 Error
messages
A malfunction is indicated on the display by an "F" fol-
lowed by a number. In addition, the "crossed-out flame"
symbol is displayed.
Fault
with
Description
Possible cause
No.
"F.."
0
Open circuit in flow sensor
1
Open circuit in return sensor
10
Short circuit, flow sensor
11
Short circuit, return sensor
13
Short circuit, cylinder sensor
20
Safety temperature limiter has triggered
22
Water pressure too low, lack of water
Water pressure less than 0.3 bar
23
Temperature spread in boiler block too great because volume
of water in circulation is inadequate
Pump blocked or defective
Pump power inadequate
System throttled without diverter
24
Increase in temperature at the block or feed sensor too rapid
Pump blocked or defective
Pump power inadequate
System throttled without diverter
27
"Extraneous light"
Flame detected although gas valve is closed; electronics
fault
28
No flame at start
Gas supply missing, ignition or flame detection defective
29
No flame in operation
Fault in gas supply
30
Open circuit in boiler sensor
31
Short circuit in boiler sensor
32
Speed deviation too great; fan speed out of tolerance
Fault in cable harness, fan fault
33
Pressure cartridge is not switching on
34
Pressure cartridge is not switching off (when fan stops)
37
In emergency operation, increase in minimum speed
Temporary problems in air path
42
Coding resistor short circuited
Coding resistor short circuited or fault in cable harness
43
Coding resistor open circuit
Coding resistor open circuit or cable harness defective
49
eBus voltage short circuited
e.g. VRC 630/620 connected with reversed polarity or Net-
dialog incorrectly connected
50
Flue gas pressure cell not switching
Water level in flue gas manifold too high or flue gas instal-
lation blocked
60
Fault with gas valve act
Electronics defective
61
Fault with gas valve actuation -
Electronics defective
62
Fault with gas valve switch-off
Electronics defective or flame still detected 4 s after gas
shut off
63
EEPROM error
Electronics defective
64
ADC fault
Electronics defective or short circuit in safety-related sen-
sor
65
Temperature of electronics (ASIC) too high
Electronics defective
66
Electronics error
Electronics defective
70
DSN error
Electronics and display identifiers do not agree
73
Water pressure sensor fault
Pressure sensor not connected or short circuit
74
Water pressure sensor fault
Pressure sensor defective or cable open circuit
Table 9.3 Error messages
Troubleshooting 9
