Appendix
46 Installation and maintenance instructions ecoTEC plus 0020261188_00
Message Possible cause Measure
F.75 Pump fault/water defi-
ciency
D.149 = 7, incorrect pump de-
tected
1. The detected pump is not correct for the product code; check
the product code.
2. Use the pump that has the correct article number.
D.149 = 8, flow rate at the end
of the purge programme is in-
sufficient
1. Check whether the stopcocks and thermostatic valves are
open.
2. Check the filling pressure; purge the circuit.
– ≥ 0.15 MPa (≥ 1.50 bar)
F.77 Accessory fault (flue non-
return flap, condensate pump,
etc.)
No feedback from the flue non-
return flap or the feedback is
incorrect
▶ Check that the flue non-return flap works without any prob-
lems.
Flue non-return flap defective ▶ Replace the flue non-return flap.
No feedback from the condens-
ate pump or the feedback is in-
correct
▶ Check that the condensate pump is working correctly.
F.83 Fault: Flow and/or return
temperature sensor temperature
change
Water deficiency ▶ Fill the heating installation. (→ Page 21)
Flow NTC: No contact ▶ Check whether the flow NTC is lying against the flow pipe cor-
rectly.
Return NTC: No contact ▶ Check whether the return NTC is lying against the return pipe
correctly.
F.84 Fault: Temperature differ-
ence at the flow and return tem-
perature sensors
Flow NTC installed incorrectly ▶ Check that the flow NTC has been installed correctly.
Return NTC installed incorrectly ▶ Check that the return NTC has been installed correctly.
F.85 Flow and return temperat-
ure sensors have been installed
incorrectly (inverted)
Flow/return NTC installed on
the same/incorrect pipe
▶ Check that the flow and return NTCs have been installed on
the correct pipe.
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