Chaffoteaux & Maury MINIMA MX2 30 FF NG - 25 ELECTRICAL DIAGRAMS; Faults and Possible Causes; Wiring Diagram

45
Earth
Earth
IS
THERE STILL
A PROBLEM?
NORMAL
OPERATION
NONO
YESYES
FAULTS POSSIBILE CAUSES
11
22
33
44
55
66
77
88
99
C
Drawing D.H.W:
When you turn on a tap
burner switches off
Drawing D.H.W:
radiators heat up in summer mode
Drawing D.H.W:
insufficient hot water
temperature
Drawing D.H.W:
noisy operation
Decrease/increase
heating circuit pressure
Repeated shutdowns
Repeated intervention of safety thermostat
When cold water tap turned off, the boiler
ignites
Insufficient radiator temperature
- air in secondary heat exchanger
- faulty D.H.W. flow switch
- faulty 3-way valve / gravity effect (see 
page 41)
- check temperature probes
- check gas pressures
- check water flow rate
- check secondary heat exchanger
- primary heat exchanger faulty or
lime-scale deposits
- low heating system water pressure
- check gas pressures
-
check temperature probes
- check for leaks on the heating circuit
- faulty filling-loop
- faulty secondary heat exchanger
- expansion vessel faulty
- faulty detection electrodes
- check gas settings
- check flame detection electric circuit
- check temperature probes
- overheat thermostat not calibrated correctly
- air in primary water circuit
- drop in pressure in the water mains, with
consequent water hammer
- check C.H. temperature probe
- check by-pass
- check gas pressures
25
Electrical Diagrams