Table 30 continued: Lockout Errors
Display Information
Alert
Description
Possible Cause
Solution
EO6
Gas Sensor Failure
Pressure Sensor Reading Low
The gas sensor reading is too
low compared to the expected
value for the modulating gas
valve actuator position.
When the furnace is operating
at 75% or higher – greater than
8 VDC analog input voltage –
the manifold pressure sensor
must read 1.4” w.c. or higher
A. Modulating actuator / ball
valve not properly aligned
1. Perform Modulating System
Gas Valve Alignment
procedure as defined in the
service manual.
B. Line pressure too low
1 . Insure line pressure is
properly adjusted for the
gas and application. Correct
as necessary.
C. Intermediate regulated
pressure too low
1. Insure the safety gas valve(s)
are properly adjusted to the
specified outlet pressure.
Adjust per the installation
instructions as necessary.
D. Wrong gas pressure sensor
installed
1. Insure the proper gas sensor
– either Natural Gas or LP
– is installed. Replace as
needed .
E . Gas pressure sensor faulty
1. Insure gas sensor is installed
properly and wired per
the unit wiring diagram.
Replace as necessary.
EO7
Gas Sensor Failure
Pressure Sensor Reading High
The gas sensor reading is too
high compared to the expected
value for the modulating gas
valve actuator position.
When the furnace is operating
at 75% or lower – less than 8
VDC analog input voltage – the
manifold pressure sensor must
read 2.8" w.c. or lower
A. Modulating actuator / ball
valve not properly aligned
1. Perform Modulating System
Gas Valve Alignment
procedure as defined in the
service manual.
B. Line pressure too high
1 . Insure line pressure is
properly adjusted for the
gas and application. Correct
as necessary.
C. Intermediate regulated
pressure too high
1. Insure the safety gas valve(s)
are properly adjusted to the
specified outlet pressure.
Adjust per the installation
instructions as necessary.
D. Wrong gas pressure sensor
installed
1. Insure the proper gas sensor
– either Natural Gas or LP
– is installed. Replace as
needed .
E . Gas pressure sensor faulty
1. Insure gas sensor is installed
properly and wired per
the unit wiring diagram.
Replace as necessary
EO8
Improper Flame Signal
Control senses flame present
when the gas valve is
commanded off.
A. Flame remains lit in “Off”
cycle
1. Gas valve leaks - check
wiring to remove continuous
24V to gas valve.
2. Gas valve is stuck open –
remove, repair or replace
gas valve.
EO9
No Firing Rate Input
Call for heat is sensed (R & W
closed) but firing rate is below
defined voltage threshold for
furnace operation.
A. Faulty wiring into the “Analog
+” and “Analog –“ terminals
1. Insure wiring is connected
per unit wiring diagram.
2. Check for loose pins or bad
connections.
3. Check for frayed wiring or
shorts to ground.
B. No signal from source.
1. Check firing rate input
voltage – must be greater
than 1.5 VDC.
2. Troubleshoot controller
providing firing rate input to
the VB-1200 control board.
Eid
Invalid I.D. Plug
The installed I.D. plug is not
valid for this control board.
A. Incorrect I.D. plug installed
1. Insure I.D. plug is correct for
the furnace – check label.
2. Insure I.D. plug is properly
inserted into the mating
connector on the control
board .
3. With the I.D. plug installed,
cycle power to the furnace.
The board will display the
I.D. plug identity upon
power-up.
4. Install correct I.D. plug as
needed .
IM-1125-13 • REBEL ROOFTOPS
74
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