Amana GUCA045AX30 Service Instructions Manual page 71

ing) is established, the hot surface ignitor will be de-
energized.
6. The micro-amp reading should be 1 to 4 micro-amps.
If the micro-amp reading is less than the minimum speci-
fied, check for high resistance wiring connections,
coated flame sensor, the distance between the sensor
and flame ground connections or poor grounding.
Note: Contaminated fuel or combustion air can create a
nearly invisible coating on the flame sensor. This coating
works as an insulator causing a loss in the flame sense
signal. If this situation occurs the flame sensor must be
cleaned with emery cloth or steel wool.
7. If absolutely no reading, check for continuity on all com-
ponents and if good - replace ignition control module.
8. After check and/or replacement of flame sensor, rein-
stall burner compartment door and verify proper unit
operation.
S-22 CHECKING FLAME ROLLOUT SWITCH
A temperature activated manual reset control is mounted
to the burner bracket on all models as shown in the follow-
ing two figures.
Flame Rollout
Protection Devices
*
* *
*
2
*
* *
Rollout Protection Devices
(Upflow/Horizontal Models)
Flame Rollout
Protection Devices
Rollout Protection Devices
(Counterflow/Horizontal Models)
SERVICING
This control is wired in series with the gas valve. The con-
trol is designed to open should a flame roll out accur. An
over firing condition or flame impingment on the heat shield
may also cause the control to open.
To aid in identifying these controls, color coded labels are
attached to the back of these controls. Refer to the follow-
ing chart for temperature settings, color codes and the num-
ber of controls used on each unit.
Part Number
Open Setting (°F)
Color Code(s)
GUCA045AX30
GUCA070AX30
GUCA070AX40
GUCA090AX40
GUCA090AX50
GUCA115AX50
GCCA045AX30
GCCA070AX30
GCCA070AX40
GCCA090AX40
GCCA090AX50
GCCA115AX50
If the rollout control has opened the circuit between the
ignition control and gas valve will be interrupted. The igni-
tion will cycle and try to light 3 times but will not sense flame
and go into lockout.
WARNING
LINE VOLTAGE NOW PRESENT.
1. Remove burner compartment door to gain access to
the rollout switch(es) mounted to burner bracket.
The servicer should reset the ignition control by opening
and closing the thermostat circuit. Then look for the igniter
glowing which indicates there is power to the ignition con-
trol.
2. Measure the voltage between each side of the rollout
control and ground during the ignition attempt. Refer to
the following figure.
Checking Flame Rollout Switch
ROLLOUT LIMT SWITCHES (101235__)
10 13 14
300 350 200
Green Gray Yellow
1
2
2
VOLT / OHM
METER
Red
Reset
Button
15 17
220 210
Orange White
2
2
2
1
2
2
2
2
2
Color
Identifing
Tab
71
Rev. 0