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Display Code
Code Type
A A 0 0 3 3
Alert
A A 0 0 4 4
Alert
A A 0 0 5 5
Alert
A A 0 0 7 7
Alert
A A 0 0 8 8
Alert
A A 1 1 1 1
Alert
A A 1 1 5 5
Alert
E E 0 0 1 1
1hr L/O
E E 0 0 2 2
10s L/O
E E 0 0 3 3
10s L/O
E E 0 0 4 4
30s L/O
E E 0 0 5 5
30s L/O
E E 0 0 8 8
10s L/O
E E 0 0 9 9
0s L/O
E E 1 1 1 1
10s L/O
E E 1 1 3 3
10s L/O
E E 1 1 8 8
10s L/O
E E i i d d
10s L/O
Return Air Smoke Detector
The return air smoke detector is designed to shut off the
unit if smoke is sensed in the return air stream. Sampling
the airflow entering the unit at the return air opening
performs this function.
In order for the smoke detector to properly sense smoke in
the return air stream, the air velocity entering the unit must
be between 500 and 4000 feet per minute. Equipment
covered in this manual will develop an airflow velocity that
falls within these limits over the entire airflow range
specified in the evaporator fan performance tables.
RT-SVX071D-EN
Description
Insufficient Combustion Air
Limited Low Fire (due to Lost Flame Auto-Adaptation)
Weak Flame Signal
Loss of Inducer Motor Control
Air Sensor Null Pressure Check out-of-tolerance
Failed Ignition — split manifold burner
Weak Flame Signal — split manifold
Failed Ignition
Primary Limit Failure
Modulation Valve Failure
Air Sensor Failure — Pressure Reading Low
Air Sensor Failure — Pressure Reading High
Improper Flame
No R-W Enable
1287 Lockout (L/O)
Open fuse
1287 Improper Flame
Invalid I.D. Plug Installed
Additional Comments and Notes
Blocked vent with actuator position derated by >20%
from FRI setting
Flame loss at low fire results in an auto-adjustment that
limits the burner turn down during the rest of the current
call for heat.
Flame presence signal of less than 1.5µA indicates an
aged flame rod.
Air pressure is not modulating down at minimum inducer
drive.
Air pressure sensor zero reading appears to be out-of-
tolerance.
Failed Ignition, Split manifold burner, retries exhausted.
Weak Flame Signal, one or more split-manifold staged
burners.
Four failed ignition attempts have occurred.
Verify Primary Limit input at connector J8 and fuse at
F1.
Valve Actuator did not reach a Park or Full On position.
Includes insufficient air lockout due to blocked vent.
Includes air switch failure to open during pre-purge
switch check.
Includes air switch failure to close during pre-purge
switch check.
An R-W open circuit is preventing the control from
operating on a non-zero Firing Rate Demand or Firing
Rate Input.
1287 L/O causes a 1285 L/O. Check 1287 control board
LED state per the 1287 LED key below.
Unexpected flame, Split manifold burner.
Compressor Start-Up
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been properly trained in
handling live electrical components perform these
tasks.
1. Attach a set of service gauges on the suction and
discharge gauge ports for each circuit.
Proceed to the next Service Test step if continuing from
previous component start-up or until the desired start-
up component test is started.
Unit Start-Up
55
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