18 6 720 607 090
15.Fault Finding
16. Short Parts List
Fig. 23
Problem
Cause Solution
Incorrect water temperature.
Incorrect gas rate. Check the gas supply to appliance gas isolation valve.
Open the gas isolation valve.
Check the burner pressure.
Check the inlet pressure.
Water section sticking or faulty. Clean or replace.
Incorrect water flow rate.
Incoming supply valve closed. Open supply valve.
Low water pressure. Check the water pressure is above 0.2 bar.
Water section sticking or faulty. Clean or replace.
Noise.
Scale in heat exchanger. Descale and service.
High gas rate. Check the burner pressure.
Low water flow rate. Check the water flow rate.
Pilot flame will not light or stay
lit.
No gas supply. Connect gas supply.
Gas isolation valve closed. Open gas isolation valve.
Air in gas line. Purge the line.
Pilot injector blocked. Clean/replace the injector.
No spark. Clean or replace the electrode, Piezo unit or cable.
Main burner will not light.
Gas pressure low. Check the inlet and burner pressure.
Gas isolation valve partially closed. Open the gas isolation valve.
Low water rate. Check the water rate.
Water section diaphragm faulty. Replace the diaphragm.
Gas valve faulty. Replace the gas valve.
Explosive ignition.
Reduced pilot flame. Clean or replace the pilot injector assembly.
Faulty slow ignition valve. Replace the slow ignition valve.
Description Part Number
1
Knob and Bezel 5 110 844
2
Pilot Burner (75) 5 110 880
Pilot Burner
(Se-duct installation)
5 113 993
3
Pilot Injector (5) 5 110 884
Pilot Injector
(Se-duct installation)
5 113 787
4
Thermocouple 5 110 886
5
Gas Valve 5 110 894
6
Water valve 5 110 959
7
Diaphragm (F) 5 110 963
8
Piezo Igniter 5 110 953
9
Spark Electrode 5 110 956
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