Fault Finding.
Problem | Possible Cause | Solution |
Appliance does not light | No gas supply | Connect to supply |
| Blocked pilot | Replace pilot injector |
Pilot lights but no main burner | Split/Distorted diaphragm | Replace |
Smell of gas | Luminous flame | Clean burner |
| Loose gas connection | Locate leak with soap solution |
Yellow flame | Burner venturi blocked | Clean with venturi brush |
Water leak on top of water valve lid | Damaged O ring | Replace O ring, grease with |
|
| Unisilkon L641# 8709918413 |
| Excessive pressure | Check water isolating valve. |
|
| (Must be gate valve or similar) |
| Frost damage | Drain appliance or fit Exogel |
| expansion valve # H707060151 | |
Low burner flame, water does not | Low inlet gas pressure | Check supply regulator and pipe |
heat up. |
| size |
| Low burner pressure | Check appliance regulator |
|
| Check thermostat bellows |
|
| Check thermostat insert |
Low water temperature | Water flow rate set too high | Set flow rate |
| Low gas pressure | Check pressure |
| Thermostat faulty/out of | Replace/Adjust thermostat |
| adjustment |
|
Low water flow | Low water pressure | Check and adjust |
| Blocked water valve | Clean filter |
| Blocked heat exchanger | Descale |
| Blocked shower rose or tap | Clean |
| aerator |
|
Shower goes hot & cold | Low flow water saver shower rose | Replace with less restrictive rose. |
|
| Check operation at other tap |
Operates only at high water flow | Relief valve spring corroded | Replace valve |
| Installed incorrectly, cold supply to | Correct installation |
| hot outlet |
|
Cuts off when operating | Thermostat faulty/out of | Replace/Adjust thermostat |
| adjustment |
|
| Wrong thermostat insert | Fit correct part |
Operates only with slow light valve | Faulty diaphragm | Replace |
loose | Blocked passage between slow | Clean |
| ||
| light & venturi |
|
| Faulty slow light valve | Clean/Replace |
BISN0047.0 | 26/06/2007 Page 6 |
