Appendix
0020261188_00 ecoTEC plus Installation and maintenance instructions
45
Message
Possible cause
Measure
F.61
Gas safety valve drive
fault
Gas valve assembly defective
▶
Replace the gas valve assembly.
PCB defective
▶
Replace the PCB.
F.62
Gas safety valve connec-
tion fault
PCB defective
▶
Replace the PCB.
The connection to the gas valve
assembly has been interrup-
ted/broken
▶
Check the connection to the gas valve assembly.
F.63
Fault: EEPROM
PCB defective
▶
Replace the PCB.
F.64
Fault: Electronics/NTC
Flow NTC short circuit.
▶
Check that the flow NTC works correctly.
Return NTC short circuit
▶
Check that the return NTC works correctly.
PCB defective
▶
Replace the PCB.
F.65
Electronics temperature
fault
Electronics overheated
▶
Check the external heat effects on the electronics.
PCB defective
▶
Replace the PCB and the ionisation electrode.
F.67
Flame plausibility fault
PCB defective
▶
Replace the PCB.
F.70
Invalid device specific
number (DSN)
Device Specific Number not
set/is incorrect
▶
Set the correct Device Specific Number.
Output range coding resistor
missing or is incorrect
▶
Check the output range coding resistor.
F.71
Flow temperature sensor
fault
The flow NTC reports a con-
stant value
▶
Check the positioning of the flow NTC.
Incorrect position of the flow
NTC
▶
Check the positioning of the flow NTC.
Flow NTC defective
▶
Replace the flow NTC.
F.72
Flow and/or return temper-
ature sensor fault
Flow NTC defective
▶
Replace the flow NTC.
Return NTC defective
▶
Replace the return NTC.
F.73
Water pressure sensor
signal in the wrong range (too
low)
Short circuit in the cable har-
ness
▶
Check the cable harness.
Interruption in the cable harness
▶
Check the cable harness.
Water pressure sensor defect-
ive
▶
Replace the water pressure sensor.
F.74
Water pressure sensor
signal outside correct range (too
high)
Short circuit in the cable har-
ness
▶
Check the cable harness.
Interruption in the cable harness
▶
Check the cable harness.
Water pressure sensor defect-
ive
▶
Replace the water pressure sensor.
F.75
Pump fault/water defi-
ciency
Malfunction
▶
Call up diagnostics code
D.149
to obtain further information
about the malfunction.
Overview of diagnostics codes (
→
Page 39)
D.149
= 1, pump blocked alarm
1.
Remove the blockage from the pump.
2.
Replace the pump.
D.149
= 2, electrical pump fault
alarm
1.
Check the pump's supply voltage.
2.
Replace the pump.
D.149
= 3, pump dry running
alarm
1.
Check the pressure of the hydraulic circuit; ensure that there
is no air in the circuit.
2.
Replace the pump.
D.149
= 5, no pressure peak
detection
1.
Check the system pressure.
2.
Purge the heating installation (purge programme).
3.
Check the water pressure sensor.
4.
Replace the water pressure sensor.
D.149
= 6, no feedback from
the pump
1.
Check the pump's cable harness.
2.
Check the main PCB.
3.
Check that the plugs are connected correctly.
4.
Check the pump's supply voltage.
–
≥
195 V
5.
Replace the pump.
6.
Replace the main PCB.
