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Poor MV output.
Excessive draft.
Recirculation of flue
products.
Excessive tempera.
ture.
Improper pilot flame
size or characteristic.
Defective thermocouple.
Weak holding BASO
power unit.
insufficient MV output.
Weak or defective ther.
mocou pie.
High resistance in con-
trol circuit.
Loose thermostat wiring
or defective thermostat.
Defective actuator.
Use Test Procedure lB.
Baffle secondary air or
shield pilot burner.
Check venting and main
burner orifice sizing and
correct where necessary.
Check main burner in-
put and correct if
nec-
essary.
Check gas pressure,
clean pilot burner, and
adjust flame.
Test thermocouple under
Test Procedures
I
and
II
on page 2.
Test under Procedure lll.A.
Use Test Procedure
lB.
(Check and correct as
in
(a) through (d) above).
Use Test Procedure
I
and
Replace thermocouple if
necessary.
Use Test Procedure
Il-Ill.
Isolate source of resistance
and correct or replace as
indicated.
Use Test Procedure IV. Cor-
rect or replace as indicated.
Use Test Procedure lilB or
Replace if necessary.
A
CONDITION
Pilot
burner outage
or
varying performance.
Pilot burner burning, plug
valve knob turned to ON
position, thermostat call-
ing for heat. Main burner
does not come on.
Thermostat not calling for
heat,
or turned way
down, plug valve knob
in ON position - main
burner will not shut off.
SERVICE SUGGESTIONS
POSSIBLE CAUSE
Shorted thermostat cir-
cuit.
Foreign particles lodged
between valve seat.
9
REMEDY
Check thermostat wires for
shorts.
Remove top of control and
clean valve seat.
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