Fault Finding; Short Parts List - Worcester WR 325 BF Installation And Servicing Instructions

12. Fault Finding

Problem
Incorrect water temperature
Incorrect water flow rate
Noise
Pilot flame will not stay alight
Main burner will not light
Explosive ignition

13. Short Parts List

Pilot Burner
Pilot Injector
Thermocouple
Spark Electrode
Piezo Unit
Water Section
Diaphragm
Slow Ignition Valve
Gas Valve
Temperature Control Knob
Control Facia Plate
Cause
Incorrect gas rate
Water section sticking or faulty
Incoming supply valve closed
Low water pressure
Water section sticking or faulty
Scale in heat exchanger
High gas rate
Low water flow rate
No gas supply
Gas service cock closed
Air in gas line
Pilot injector blocked
No spark
Gas pressure low
Gas service cock partially closed
Low water rate
Water section diaphragm faulty
Gas valve faulty
Reduced pilot flame
Faulty slow ignition valve
Part
10
Solution
Check the gas supply to appliance gas service cock
Open the gas service cock
Check the burner pressure
Check the inlet pressure
Clean or replace
Open supply valve
Check the water pressure is above 0.1 bar
Clean or replace
Descale and service
Check the burner pressure
Check the water flow rate
Connect gas supply
Open gas service cock
Purge the line
Clean/replace the injector
Clean or replace the electrode, Piezo unit or cable
Check the inlet and burner pressure
Open the gas service cock
Check the water rate
Replace the diaphragm
Replace the gas valve
Clean or replace the pilot injector assembly
Replace the slow ignition valve
Manufacturer's Reference
8 718 105 048
8 708 200 005
¢ ¡ ¢ £
8 747 202 082
8 708 107 002
8 748 108 023
8 707 002 457
8 700 503 051
8 708 503 063
8 707 011 028
8 702 000 111
8 701 000 104