National Products BW3 - Manual (Page 18)

12. Be sure to check tightness of pilot connections and condition of burner flames after reassembly. (See Fig. 11.)
13. Be sure vent pipe connections to chimney are secure and no obstructions are present.
PROCEDURE 8—BLOWER
The blower motor features permanently lubricated ball bearing construction. Lubrication is not required.
SERVICE HINTS
You may avoid inconvenience and service calls by checking these points before you call for service.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
1. Do not try to light any appliance.
2. Do not touch any electric switch; do not use the phone.
3. Leave the building immediately, then call your gas supplier.
4. If you cannot reach the gas supplier, call the fire department.
IF SYSTEM IS NOT HEATING OR NOT GIVING ENOUGH HEAT. . .
Possible Cause What To Do
Thermostat is not set correctly Reset thermostat above room temperature.
Burner is not operating properly
Check flame. If it is yellow, burner is not getting enough air. If flame is blue and noisy and seems to lift off
the burner, burner is getting too much air. Contact your service technician.
No electric power to boiler Check overcurrent protection. Check to be sure electric power supply circuit is on.
Controls out of adjustment Reset according to instructions.
Radiators not heating Open radiator vents to vent excess air. Check flow control valve (if used). It may be in closed position.
Circulator pump not running Check overcurrent protection. Check relay operation.
Poor electrical contact Check all control terminals and wire joints.
Chimney flue is blocked
Pressure switch will not close and pilot spark will not operate to start pilot. Have your service technician
check and correct, if necessary.
Rollout switch blown
Have your service technician check heat exchanger for blockage. Replace rollout switch with exact replace-
ment.
IF BURNER IS NOISY. . .
Possible Cause What To Do
Gas input amount is incorrect Contact your service technician.
RELIEF VALVE LEAKING. . .
Possible Cause What To Do
Dirt on seat Open valve manually. Allow water to run and clear valve seat.
Waterlogged expansion tank Drain tank. See instructions.
HAVE YOUR SERVICE TECHNICIAN CHECK ANY PROBLEM YOU ARE UNABLE TO CORRECT.
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