39
PTEC-M-1A
Control Board
Characteristics and
Diagnostics
•
On Board Diagnostics
-The LED
light will flash once every 6
seconds. If an error occurs the LED
will flash from 2 to 8 flashes every
6 seconds. Refer to the chart below
for possible causes for the flash
codes.
Flashes
Situation
Corrective Action
1 Flash
Control Ok
Board OK
2 Flashes
24vac Fuse Blown
Replace fuse
3 Flashes
Indoor Coil Thermistor failure
Replace Indoor Coil Thermistor
4 Flashes
Mode Switch Failure
Replace Board
5 Flashes
Thermostat Control
Replace Board
6 Flashes
Bad Thermostat Input Failure
Replace Board
8 Flashes
Indoor Ambient Thermistor Failure
Replace Thermistor
•
Self diagnostic Mode
- The
diagnostic mode is initiated by the
following routine. Set the
thermostat in the coolest position
and the mode switch in the off
position. Rotate the thermostat
counterclockwise to the warmest
setting and rotate the mode switch
counterclockwise to the fan only
position simultaneously and wait
two seconds (or until fan relay
engages). Return the thermostat
and mode switch to their starting
positions by rotating them both
clockwise simultaneously. The
diagnostic routine will run the unit
through each mode in the
following sequence:
Mode
Time
Fan Only
17
Off
1
High Cool
17
Off
3
(reversing valve energize)
High Heat
(rev cycle)
17
Off
1
Low Heat
(elec heat)
5
Содержание PTEC-070
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