Worcester 47-406-56

Fault finding
6 720 811 922 (2014/07) 49
12.3 FAULTS THAT ARE NOT DISPLAYED
12.4 SENSOR VALUES
12.4.1 FLOW TEMPERATURE SENSOR
12.4.2 DHW TEMPERATURE SENSOR
12.5 CODE PLUG
Appliance faults Remedy
Excessive combustion noise; rumbling noises ▶ Insert coding plug correctly. Replace if required.
▶Check gas type.
▶ Check gas supply pressure. Adjust if required.
▶ Check flue system. Clean or repair if required.
▶ Check gas-air ratio in the combustion air and flue gas. Replace gas valve if required.
Flow noises ▶ Set pump stages or pump parameters correctly and match to maximum output.
Heat-up takes too long ▶ Set pump stages or pump parameters correctly and match to maximum output.
Flue gas readings incorrect; CO levels too high ▶ Check gas type.
▶ Check gas supply pressure. Adjust if required.
▶ Check flue system. Clean or repair if required.
▶ Check gas-air ratio in flue gas. Replace gas valve if required.
Ignition too strong, too weak ▶ Check gas type.
▶ Check gas supply pressure. Adjust if required.
▶ Check power supply.
▶ Check electrodes and leads. Replace if required.
▶ Check flue system. Clean or repair if required.
▶ Check gas-air ratio. Replace gas valve if required.
▶ For natural gas: Check external gas flow limiter. Replace if required.
▶ Check burner. Replace if required.
Set flow temperature exceeded ▶ Switch OFF automatic cycle block, i.e. set the value to 0.
▶ Set the required cycle block, e.g. standard setting of 3 minutes.
Condensate in air box ▶ Insert diaphragm in the mixing facility as per installation instructions. Replace if required.
DHW temperature is not reached ▶ Insert coding plug correctly. Replace if required.
▶ Check whether voltage (230 V AC) is present across terminal 1 and terminal 3. Repair if
required.
▶ Check flow meter. Replace if required.
Control unit is flashing (i.e. all keys, all display
segments, burner indicator etc. are flashing)
▶ Replace fuse Si 3 (24 V).
Table 31 Faults not displayed
Temperature/ °C (tol.± 10%) Resistance ( )
20 14 772
25 11 981
30 9 786
35 8 047
40 6 653
45 5 523
50 4 608
55 3 856
60 3 243
65 2 744
70 2 332
75 1 990
80 1 704
85 1 464
90 1 262
95 1 093
100 950
Table 32
Temperature/ °C (tol.± 10%) Resistance ( )
0 33242
10 19947
20 12394
30 7947
40 5242
50 3548
60 2459
70 1740
80 1256
90 923
Table 33
Appliance Number
24-3 C 23 8 714 431 154 0
28-3 C 23 8 714 431 156 0
30-3 C 23 8 714 431 172 0
Table 34