Troubleshooting
ecoTEC plus installation and maintenance instructions 0020134823_01 61
14
Code Meaning Cause
F.73 Water pressure sensor signal in the wrong range
(too low)
Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pres-
sure sensor defective
F.74 Water pressure sensor signal outside correct range
(too high)
Line to water pressure sensor has short-circuited at 5 V/24 V
or internal fault in water pressure sensor
F.75 Fault, no pressure change detection when starting
pump
Water pressure sensor and/or pump defective, air in heating installa-
tion, too little water in boiler; check adjustable bypass, connect exter-
nal diaphragm expansion vessel to the return
F.76 Overheating protection on primary heat exchanger has
responded
Cable or cable connections for safety fuse in primary heat exchanger
or primary heat exchanger defective
F.77 Flue non-return flap/condensate pump fault No response from flue non-return flap or condensate pump defective
con No communication with the PCB Communication fault between display and PCB in the electronics box
13.3 Fault codes (continued)
14.3 Using the function menu
To remedy faults in the boiler, you can use the function
menu to control and check individual components of the
heating installation (¬section13.3).
14.4 Running check programmes
By activating various check programmes, you can trigger
special functions on the boiler (¬table.11.1). The display
shows which check programme you have chosen.
> Read how to start the check programmes in section 11.4.
14.5 Resetting parameters to factory settings
As well as the option to manually reset individual parame-
ters to the factory settings specified in ¬table12.1, you can
also reset all parameters at once.
> Set the value of the diagnostics code parameter D.096
to "1" (¬section12.1).
You have now reset all parameters to factory settings.
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