281 Issue 1 - Service Manual - BX3
28
11±1.5 mm
8.5±1.5 mm
Sparker probe end
is in alignment with
burner
centreline
±2 mm.
12±2 mm
11±2 mm
6.3 Spark Igniter Servicing
Isolate the heater power and gas supply from the unit.
Checking the spark igniter
1. Unscrew the spark igniter away from the burner
2. Check spark igniter electrode, lead and plug connection
3. Clean igniter probe and make sure there is a spark gap of approx
±2
mm.
4. Then reassemble.
Checking spark igniter location relative to burner face
1. Remove the burner assembly as described in removal procedure 5.
2. Measure the distances as shown in the diagram below.
3. Installation is a reversal of the removal procedure.
6.4 Flame Sensor Servicing
Isolate the heater power and gas supply from the unit.
Checking the flame sensor
1. Check that the flame sensor rod is clean, located correctly and the lead and plug
connection is in good condition.
2. Reassemble.
Checking flame sensor location relative to burner face
1. Remove the burner assembly as described in removal procedure 5
2. Measure the distances as shown in the diagram below.
3. Installation is a reversal of the removal procedure.
