44 Installation and maintenance instructions ecoFIT pure 0020230535_07
Code Meaning Cause
F.75 Fault: No pressure change detection when start-
ing pump
Water pressure sensor and/or pump defective, air in the heating installa-
tion, insufficient water in the product; check adjustable bypass, connect
external expansion vessel to the return
F.76 Overheating protection on primary heat ex-
changer has responded
Cable or cable connections for safety fuse in primary heat exchanger or
primary heat exchanger defective
F.77 Fault: Flue non-return flap/condensate pump No response from flue non-return flap or condensate pump defective
F.83 Fault: Flow and/or return temperature sensor
temperature change
When the burner starts, the temperature change registered at the flow
and/or return temperature sensor is non-existent or too small.
– Insufficient water in product
– Flow or return temperature sensor not in correct position at pipe
F.84 Fault: Temperature difference at the flow and
return temperature sensors
The temperature sensors return implausible values (temperature differ-
ence < -6 K).
– Flow and return temperature sensors are inverted
– Flow and/or return temperature sensors installed incorrectly
F.85 Fault: Flow and return temperature sensors
incorrectly installed
The flow and/or return temperature sensors have been installed on the
same pipe/incorrect pipe
F.87 Ignition transformer not connected Ignition transformer plug not plugged in or has come loose, multiple
plug on the PCB not plugged in correctly, interruption in cable harness,
electronics defective
F.88 Gas valve not connected Gas valve plug not plugged in or has come loose, multiple plug on the
PCB not plugged in correctly, interruption in cable harness, electronics
defective
F.89 Incorrect pump detected Unsuitable pump connected, PWM plug not plugged in or has come
loose, multiple plug on the PCB not plugged in correctly, interruption in
cable harness, electronics defective
con No communication with the PCB Communication fault between the display and the PCB in the electronics
box
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