User Manual

22
lost communication with the
modulating gas valve.
• Check that valve is powered
and operating correctly.
• Check for signal (0-
10VDC) on
terminal J11. The unit will
not fire until valve has
proven closed (<=2.0 VDC
signal on terminal J11)
• Check ICECON2 fuses
NO DISPLAY ON
ICECON2 CONTROLER
• Board requires 24VAC on terminal J2
for operation. Check fuses on both
the control panel and Circuit board
and replace as necessary.
• Verify correct wiring, wiring
connections and grounding of the
electrical components.
BOARD WILL NOT
ENTER HEAT MODE
•
ICECON2 requires 24VAC on terminal J12
to enter heat mode.
• Board requires a 2.0 VDC signal on
terminal J11 before initiating trial
for ignition.
• Flame has not proven. ICECON2
requires a 24VAC signal on terminal
J22 before entering heat mode. The
controller will use 4 trials for
ignition before indicating “flame
error”.
UNIT WILL NOT
MODULATE
• Check for free rotation of the
modulating valve
• Check for correct feedback signal
SUPPLY FAN DOES
NOT INGAGE
• Check for power on terminal J5 on the
ICECON2 controller. If power is trace
unit wiring as per diagram to
determine fault.
• Check for power on terminal J6. If
power is not present trace wiring as
per diagram to determine fault.
• If power is present on J6 but not J5
the system is not calling for the
supply air.