LED Blink Codes
Electromechanical Ignition Board
2 flash - 1 Hour Lockout
3 flash - Pressure Switch
4 flash - TCO Open
5 flash - Flame W/O Gas
6 flash - Rollout Switch Open
7 flash - W1 / W2 Swapped (W2 calling before W1)
Reliatel Ignition Control (IGN)
Green
On: Normal no call for heat
Slow flash: Active call for heat
Fast flash: Not communicating with RTRM
Error codes
2 flash – system lockout – failure to sense flame
3 flash – pressure switch failure to close when CBM stops or open when CBM starts (not applicable to 12½ to 25 tons)
4 flash – TCO circuit open
5 flash – Flame being sensed yet gas valve not energized
6 flash - Flame Rollout (FR) circuit open (Not applicable to 12½ to 25 tons)
ReliaTel Refrigeration Module (RTRM)
Green Transmit LED
Very fast flash: Normal operation, information being sent to other modules.
Off: System failure
Yellow Receive LED
Very fast flash.5 second, off 1.5 second, Normal communication
1/4 second wink every 2 seconds, not communicating with any other module
Off: Board failure
Green System LED2
On: Normal operation (slight flickering is normal)
Off: No power, board failure
One blink: Emergency stop open when attempting test mode.
See attachment for a video of a One blink.
2 flashes every two seconds indicates a diagnostic is present
Continuous ¼ second blink: Test Mode
Service- RTRM-J6-10.
ON - Clogged filter switch has been closed for at least 2 minutes, indicating a clogged filter.
OFF
- Clogged filter switch is in open position or no switch is installed.
- Fan Fail switch (if installed) has opened (3-25 Ton) within the first 40 seconds, proving that the supply fan has started.
PULSING
- Fan Proving switch (also called Fan Fail Switch FFS) has failed to open (3-25 Ton) before 40 seconds. During this condition, the unit will run for 40 seconds and then stop.
- Freezestat Active
- Smoke Detector Active
- Condensate Overflow Switch Closed (if it closes 4 times in 24 hours – unit lockout)
System- RTRM-J6-9.
ON – System is powered up. This output should be on whenever the green RTRM System LED is on. Incidentally, this LED may flicker as part of its normal function on older version boards.
OFF – If 0 VDC is seen, the RTRM does not have power, the output wiring is shorted, or there is an internal failure. Remove any wires connected to this terminal and check again.
PULSING – Unit is in the TEST mode. Also during the TEST mode LED2 will pulse on and off. This output does not provide any diagnostic information, but is a good place to confirm that voltage readings taken are consistent with what should be seen on other outputs.
Cooling-RTRM-J6-8.
ON – System is in the cooling mode and actively cooling. The unit could be economizing or have one or both compressors on. If the unit is a heat pump, the reversing valve is energized as well.
OFF – System is not actively cooling. It may or may not be in the cooling mode.
PULSING – This indicator can mean one or more of the following:
Any controls
- CC1 or CC2 opens during cooling, or is open when a call for compressor occurs. The unaffected circuit will still run. With RTRM version 4.0 or greater, CC1 or CC2 circuit must open on 3 consecutive cycles. On the 4th trip, the unit will lockout.
- CPR1 Disable or CPR 2 Disable input has opened during a compressor cycle each time a compressor starts (within the first 3 minutes) for 3 consecutive cycles. It locks out on the fourth cycle. The unaffected circuit will still run.
- Supply Air Temperature is invalid and unit is VAV
Mechanical ZSM
- Zone temperature input failure after a successful input.
- Both heating and cooling setpoint inputs have failed or are not attached (such as when using a 2 - wire sensor on terminals 1 & 2).
Programmable ZSM
The ZSM has failed to communicate for 15 consecutive minutes after successful communication has occurred.
Heating-RTRM-J6-7.
ON – System is actively heating.
OFF – System is not actively heating.
PULSING – See below:
Gas heat
If any failure occurs such as loss of flame, limit switch trip, flame rollout etc, this indication is present. Further diagnostics are available by examining the Ignition Module LED.
Supply Air Temperature Sensor Failure and Unit is CV with Modulating Heat.
Electric heat
These units have safety limit switches in the electric heat control circuit. Should a limit switch trip, no diagnostic will occur, the HEAT indication will stay ON.
Heat pump
Unit is in the EMERGENCY HEAT mode. If the Compressor Disable circuit or CC1, CC2 circuits create a lockout during heating mode, a COOL FAIL (pulsing) indication will occur, not a HEAT FAIL (pulsing) indication.
HEAT FAIL and COOL FAIL at the same time, RTRM-J6-7 & 8 pulsing voltage:
- Coil temperature sensor is open or shorted. (Heat Pump)
- Unit has failed to defrost properly. (Heat Pump)
- Outdoor air sensor is open or shorted. (RTRM version 4.0 or greater.)
- Dehumidification unit- RTOM disconnected or not communicating. RTOM will flash once every few seconds.
- Emergency stop input is open.
- Factory installed phase monitor is indicating a fault
- FrostStat Input Active
- Smoke Detector Active
- Entering Evaporator Temp. Failure
VAV Additional Codes
HEAT (YC only)
Supply Air Temperature sensor has failed if configured for Modulating Heat.
COOL
Discharge air sensor (DTS) is open, shorted, or has failed.
COOL + SERVICE
- Static Pressure Transducer output voltage at RTAM J1-3 is less than 0.25VDC. The transducer output is open, shorted, or the transducer is reading a negative supply air pressure.
HEAT + COOL + SERVICE
- Static Pressure High Duct Static Trip. The static pressure has exceeded 3.5" W.C. three consecutive times.
- Ground wire on transducer is open.
ReliaTel Options Module (RTOM)
Green System LED 3
On: Normal communication with RTRM
1/4 second on, 2 seconds off: No communication
Off: No power or board failure
ReliaTel Ventilation Module (RTVM)
Green system LED 3
On: Normal communication with RTRM
1/4 second on, 2 seconds off: No communication
Off: No power or board failure
ReliaTel Air Handling Module (RTAM)
Green system LED 1
On: Normal communication with RTRM
1/4 second on, 2 seconds off: No communication
Off: No power or board failure
Economizer Actuator Module (RTEM)
Green system LED
On: OK to economize
Slow flash: Not OK to economize
Fast flash: Not communicating with RTRM
OFF: No power or system failure
1/2 second on, 2 seconds off: no communication
Error codes — 1/2 second on, 1/4 second off
1 flash – Actuator fault (on 2 seconds then a 1/2 second blink)
2 flash – CO2 sensor
3 flash – RA humidity sensor
4 flash – RA temp sensor
6 flash – OA humidity sensor
7 flash – No Communication with RTRM or OAT sensor has failed.
8 flash – MA temp sensor
9-11 flash – Internal fault
Plenum Fan LED Error Codes
1 - mains voltage phase failure
3 - over-temperature of power module
4 - internal communication error
6 - over-temperature of motor winding
7 - hall sensor error
8 - rotor locked
13 - dc-link-under-voltage
Voyager 2 Modulating Heat Board (CFMB)
Fault Indicator Output
The controller will indicate a fault condition by flashing the fault LED. The flashing pattern will be ¼ second on and ¼ second off for each count, if multiple faults are present it will dwell 2 seconds between each fault code, then dwell 5 seconds and repeat until the fault(s) are cleared.
Listed below are the fault codes.
1 flash – Not Used
2 flashes – Under Voltage - Should have 208-230V from heat transformer. Range should be +/- 10%. Measure the voltage at the board and at the combustion fan motor.
3 flashes – Over Voltage - Should have 208-230V from heat transformer. Range should be +/- 10%. Measure the voltage at the board and at the combustion fan motor. Overvoltage limit of the board is approx. 270V.
4 flashes – Over Temperature - This board is not connected to any temp/safety switches in the unit, this fault should not be experienced.
5 flashes – Over Current
Below is a video of a RTRM LED2 indicating Emergency Stop while trying to initiate test mode.
LED2 will blink one time and go back solid.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.