Greenheck Microprocessor Controller (475595 IOM) TAP v2.10 April 2014 (RVE, ERCH-01, ERT-01) - Manual (Page 39)

Display is hard to read. Unit Controller Display: Hold Esc ESC and ENTER at the same time, while
pressing
DOWN or UP to adjust display contrast.
Remote Display: Hold
ALARM,
Prg
PRG, and Esc ESC at the same time, while
pressing
DOWN or UP to adjust display contrast.
Remote display panel
displays “NO LINK” or is
blank. Hold
DOWN, UP and ENTER for 4 seconds. Set the display address to 32.
The display requires a standard 24 AWG six conductor phone cable connected to the
unit controller.
Red alarm button is
flashing. Press the
ALARM button to review and clear unit alarms. Enter the DATA
LOGGER menu to view previous alarms.
Controller resets itself or
is not on. Check the supply voltage to the controller at terminals G-G0. The board requires
24VAC. Check the 24VAC transformer in the unit control center.
Menus are locked with a
password. The factory default Manufacturer Password = 1000.
The factory default Service Password = 1000.
Temperature sensor
failure. Check the analog input terminal block (labeled terminals B1, B2, B3, etc) for loose
wires. Disconnect temperature sensors to check sensor resistance.
Troubleshooting
NTC Temperature Sensor Chart
120
110
100
90
80
70
60
50
40
30
20
10
0
4 6 8 10 12 14 16 18 20 22 24 26 28
T
emperatur
e (ºF)
Resistance (k
:)
39 DDC Controller for Tempered Air Products
®