R
e
vi
se
d
0
3
-1
1
-1
0
Y
U
N
C
A
F
U
Z
iO
N
F
E
B
R
U
A
R
Y
2
0
1
0
P
a
g
e
1
6
o
f 1
9
SOLUTION
Re-arrange or tighten.
Re-adjust to a suitable position to be burnt by the flame.
Tighten Pilot nut
Replace Pilot Set.
Replace.
Re-arrange or replace.
If there is gas pressure, it's necessary to replace Pilot Set or
re-drill the injector.
Replace.
Re-arrange or replace.
Refer to factory
Replace.
Re-arrange or replace.
Refer to factory
Replace.
Replace.
Check timer controls settings
Replace.
Replace.
Replace the batteries in Battery Box. (2 x D size)
Replace batteries in the Remote Control Unit. (2 x AAA)
POSSIBLE CAUSE
The cables of Flame Sensor and Spark Igniter are
reversed or loosened.
Flame Sensor doesn't sense the flame.
Pilot Flame is burnt inside the pilot tube.
Rear Control Board has a failure.
The wire set has a failure or the terminals have loosened.
Nozzle of Main burner is blocked.
Front and Rear Control Board have a failure.
Remote Control Unit has a failure.
The wire set has a failure or the terminals have loosened.
Valve "M" has a failure or Nozzle of Valve "M" is blocked.
Front Control Board has a failure.
Remote Control Unit has a failure.
The wire set has a failure or the terminals have loosened.
Valve "L" has a failure or Nozzle of Valve "L" is blocked.
Front Control Board has failed.
Remote Control Unit has failed.
Front Control Board has a failure
Timer control incorrectly set (e.g. am or pm settings)
AUTO function not turned on (Pg 9)
Front Control Board has a failure.
Remote Control Unit has a failure.
Front Control Board has a failure.
Remote Control Unit has a failure.
Battery power is low.
TROUBLESHOOTING GUIDE–YUNCA FUZZY LOGIC CONTROL SYSTEM continued P2/2
PROBLEM
D. Pilot is alight, sparking
continues and doesn't stop.
(No flame is sensed.)
E. Pilot is alight, main burner
cannot light up.
F. Low Flame is alight;
Medium Flame doesn't light
up.
G. Medium Flame is alight;
Low Flame doesn't light up.
H. During Spark Ignition cycles,
the appliance doesn't shut
down in 25 seconds.
I. AUTO function fails. (Cannot
AUTO turn on and AUTO turn
off the appliance.)
J. No FUZZY functions
K. PWR indicator on the front
plate flashes.
Remote Control Unit displays
weak battery.
