Bradford-White Corp U1TW40S*FRN ユーザーズマニュアル

 Page 19 

Eight flashes, 

three flashes, 

three second

pause

Thermal well sensor 

damaged or un-

plugged or gas con-
trol electronics fault

detected 

1. Damage to thermal well wires 
2. Thermal well sensor resistance 
out of range 
3. Replace thermal well
4. Verify control is not wet or 
physically damaged 
5. Reset control on/off switch 
6. Replace gas control if 8-3 error 
persists 

See Thermal Well Testing on 
page 34

Eight flashes, 

four flashes, 

three second

pause

Gas control fault

detected 

1. Verify control is not wet or 
physically damaged 
2. Reset control on/off switch 
3. Replace gas control if 8-4 error 
persists 

1. Replace gas control if wet 
or physically damaged
2. Cycle power 
3. Replace gas control

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