Ariston EuroCombi A/23 MFFI Servicing Instructions page 24

D
IS
THERE STILL A
PROBLEM?
NO
FUNCTIONS
NORMALLY
Delivery of hot water for domestic use: Delivery of hot water for domestic use:
1
when the tap is turned on, the burner goes out. when the tap is turned on, the burner goes out.
Delivery of hot water for domestic use: Delivery of hot water for domestic use:
2
the radiatores are heated in summer mode. the radiatores are heated in summer mode.
Delivery of hot water for domestic use: Delivery of hot water for domestic use:
3
water temperature is not satisfactory. water temperature is not satisfactory.
Delivery of hot water for domestic use: Delivery of hot water for domestic use:
4
noisy operation. noisy operation.
Drop/increase in pressure in primary circuit. Drop/increase in pressure in primary circuit.
5
Repeated shutdowns. Repeated shutdowns.
6
Safety thermostat is triggered repeatedly. Safety thermostat is triggered repeatedly.
7
When the cold water tap is turned off, the When the cold water tap is turned off, the
8
boiler comes on. boiler comes on.
Temperature of radiators not satisfactory. Temperature of radiators not satisfactory.
9
24
Supplied By www.heating spares.co Tel. 0161 620 6677
YES
LIST OF MALFUNCTIONS
POSSIBLE CAUSES
- Air in the secondary exchanger - Air in the secondary exchanger
- Hot water pressure switch is defective - Hot water pressure switch is defective
- 3-way valve is defective - 3-way valve is defective
- 3-way valve is defective - 3-way valve is defective
- Check heating sensors - Check heating sensors
- Check gas settings and regulation - Check gas settings and regulation
- Check water flow rate - Check water flow rate
- Check exchanger for domestic hot water - Check exchanger for domestic hot water
- Primary exchanger is defective - Primary exchanger is defective
- Low water pressure in heating system - Low water pressure in heating system
- Check gas settings and regulation - Check gas settings and regulation
- Check for leaks in heating circuit - Check for leaks in heating circuit
- Defective water supply inlet valve - Defective water supply inlet valve
- Secondary exchanger is defective - Secondary exchanger is defective
- Expansion vessal is empty - Expansion vessal is empty
- Detection electrodes are defective - Detection electrodes are defective
- Check gas settings and regulation - Check gas settings and regulation
- Check electrical circuit for flamedetection - Check electrical circuit for flamedetection
- Faulty (contacts) ntc heating sensors- - Faulty (contacts) ntc heating sensors-
- Defective (poorly calibrated) safety thermostat - Defective (poorly calibrated) safety thermostat
- Presence of air in the primary water circuit - Presence of air in the primary water circuit
- Drop in pressure in the water mains, resulting - Drop in pressure in the water mains, resulting
in water hammering in water hammering
- Check ntc heating sensor - Check ntc heating sensor
- Check by-pass - Check by-pass
- Check gas settings and regulation - Check gas settings and regulation
B029