model hcvr5108h red alarm light blinking

Overvoltage limit of the board is approx. Measure the voltage at the board and at the combustion fan motor. Measure the voltage at the board and at the combustion fan motor.ģ flashes – Over Voltage - Should have 208-230V from heat transformer. Listed below are the fault codes.Ģ flashes – Under Voltage - Should have 208-230V from heat transformer. 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. The controller will indicate a fault condition by flashing the fault LED.

three consecutive times.ġ/4 second on, 2 seconds off: No communicationġ/2 second on, 2 seconds off: no communicationĮrror codes - 1/2 second on, 1/4 second offħ flash – No Communication with RTRM or OAT sensor has failed. The static pressure has exceeded 3.5' W.C. Static Pressure High Duct Static Trip.The transducer output is open, shorted, or the transducer is reading a negative supply air pressure. Static Pressure Transducer output voltage at RTAM J1-3 is less than 0.25VDC.Supply Air Temperature sensor has failed if configured for Modulating Heat.ĭischarge air sensor (DTS) is open, shorted, or has failed. Factory installed phase monitor is indicating a fault.Dehumidification unit- RTOM disconnected or not communicating.Outdoor air sensor is open or shorted.Coil temperature sensor is open or shorted.HEAT FAIL and COOL FAIL at the same time, RTRM-J6-7 & 8 pulsing voltage: 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. Should a limit switch trip, no diagnostic will occur, the HEAT indication will stay ON. These units have safety limit switches in the electric heat control circuit. Supply Air Temperature Sensor Failure and Unit is CV with Modulating Heat. Further diagnostics are available by examining the Ignition Module LED. If any failure occurs such as loss of flame, limit switch trip, flame rollout etc, this indication is present. The ZSM has failed to communicate for 15 consecutive minutes after successful communication has occurred. Both heating and cooling setpoint inputs have failed or are not attached (such as when using a 2 - wire sensor on terminals 1 & 2).Zone temperature input failure after a successful input.

Supply Air Temperature is invalid and unit is VAV.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.With RTRM version 4.0 or greater, CC1 or CC2 circuit must open on 3 consecutive cycles. CC1 or CC2 opens during cooling, or is open when a call for compressor occurs.PULSING – This indicator can mean one or more of the following: It may or may not be in the cooling mode. If the unit is a heat pump, the reversing valve is energized as well. The unit could be economizing or have one or both compressors on. ON – System is in the cooling mode and actively cooling. 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. Also during the TEST mode LED2 will pulse on and off. Remove any wires connected to this terminal and check again. OFF – If 0 VDC is seen, the RTRM does not have power, the output wiring is shorted, or there is an internal failure.

Incidentally, this LED may flicker as part of its normal function on older version boards.

This output should be on whenever the green RTRM System LED is on. Condensate Overflow Switch Closed (if it closes 4 times in 24 hours – unit lockout).During this condition, the unit will run for 40 seconds and then stop. Fan Proving switch (also called Fan Fail Switch FFS) has failed to open (3-25 Ton) before 40 seconds.Fan Fail switch (if installed) has opened (3-25 Ton) within the first 40 seconds, proving that the supply fan has started.Clogged filter switch is in open position or no switch is installed.ON - Clogged filter switch has been closed for at least 2 minutes, indicating a clogged filter. See attachment for a video of a One blink.Ģ flashes every two seconds indicates a diagnostic is present One blink: Emergency stop open when attempting test mode. On: Normal operation (slight flickering is normal) Very fast flash.5 second, off 1.5 second, Normal communicationġ/4 second wink every 2 seconds, not communicating with any other module Very fast flash: Normal operation, information being sent to other modules. 2 flash – system lockout – failure to sense flameģ flash – pressure switch failure to close when CBM stops or open when CBM starts (not applicable to 12½ to 25 tons)ĥ flash – Flame being sensed yet gas valve not energizedĦ flash - Flame Rollout (FR) circuit open (Not applicable to 12½ to 25 tons)

Model hcvr5108h red alarm light blinking