Table of Contents
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Troubleshooting
5 Flashes: OA Quality Sensor
6 Flashes: OA Humidity Sensor
7 Flashes: OATemp Sensor
8 Flashes: MATemp Sensor
9 Flashes: RAM Fault
10 Flashes: ROM Fault
11 Flashes: EEPROM Fault
Electromechanical Control
The IGN has the ability to provide the service personnel
with some unit diagnostics and system status information.
Before turning the main power disconnect switch "Off" ,
follow the steps below to check the Ignition Module (IGN).
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be 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. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
1. Verify LED on face of the phase monitor is green. If LED
is red, correct supply power fault.
2. Verify that the LED on the IGN is burning continuously.
If the LED is lit, go to
3. If the LED is not lit, verify that 24 VAC is present
between R and B. If the LED is not lit and 24 VAC is
present replace the IGN. If 24 VAC is not present, check
transformer (TNS1). Proceed to
4. If no failures are indicated, use theTEST mode
procedures described in the "Unit Start-Up" section or
thermostat to start the unit.This procedure will allow
you to check all of the external controls (relays,
contactors, etc) and the IGN.
5. Test the system through all of the available modes, and
verify operation of all outputs, controls, and modes.
Refer to the sequence of operations for each mode, to
assist in verifying proper operation. Make the
necessary repairs and proceed to
6. If no abnormal operating conditions appear in the test
mode, exit the test mode by turning the power "Off" at
the main power disconnect switch and removing the
test mode connections.
7. Refer to the individual component test procedures if
other components are suspect.
62
Step
4.
Step 4
if necessary.
Step 6
and
Step
Heating Failure
Verify Heat Failure by Ignition Module (IGN) LED indicator:
•
OFF: No Power or Failure
•
ON: Normal
•
Slow Flash: Normal, Heat Call
•
Fast Flash: Error Code:
1 Flash: No Communication
2 Flashes: System Lockout
3 Flashes: Pressure Switch Fail
4 Flashes:TC01 orTC02 Open
5 Flashes: Flame w/o Gas Valve
6 Flashes: Flame Rollout Open
Cooling Failure
•
Cooling and heating set point (slide pot) on the
thermostat has failed.
•
CC1 or CC2 24 VAC control circuit has opened, check
CC1 & CC2 coils, and any of the controls below that
apply to the unit (HPC1, HPC2, LPC1, LPC2, Frostat™).
Resetting Cooling and Ignition
Lockouts
Cooling Failures and Ignition Lockouts are reset in an
identical manner. Method 1 explains resetting the system
from the space; Method 2 explains resetting the system at
the unit.
Method 1
To reset the system from the space, turn the "Mode"
selection switch at the thermostat to the "Off" position.
After approximately 30 seconds, turn the "Mode"
selection switch to the desired mode, i.e. Heat, Cool or
Auto.
Method 2
To reset the system at the unit, cycle the unit power by
turning the disconnect switch "Off" and then "On" .
Unit Economizer Control (ECA)
Test Procedures
Electromechanical Control
7.
This series of tests will allow you to diagnose, and
determine where, and if a problem exists in the system
economizer operation.Test 1 determines if the problem is
in the Unit, or if it is in the ECA.Test 2 tests sensor inputs.
Test 3 tests the resistors and sensors. Conduct the tests in
numerical order until problem is found.
RT-SVX21N-EN
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Table of Contents
Troubleshooting
