Troubleshooting
64 RT-SVX21P-EN
Unit Economizer Control (ECA)
Troubleshooting
ReliaTel™ Control
Verify Economizer Status by Economizer Actuator (ECA)
LED indicator:
• OFF: No power or failure
• ON: Normal, OK to economize
• Slow Flash: Normal, not OK to economize
• Fast Flash - 1/2 second on / 2 seconds off:
• Error Code: Communications failure
• Pulse Flash:2 seconds on / 1/2 second off:
• Error Code:
• 1 Flash: Actuator Fault
• 2 Flashes: CO
2
Sensor
• 3 Flashes: RA Humidity Sensor
• 4 Flashes: RATemp Sensor
• 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).
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 Step 4.
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 Step 4 if necessary.
4. If no failures are indicated, use the TEST 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 Step 6 and Step 7.
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.
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.
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.
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