Microtech 2300 - Page 19

19
OM 1364
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TROUBLESHOOTING
A2L Error – Refrigerant Sensor Fail
LED Activity Type Color Description
Rapid Flash Mode Yellow
A2L Mitigation – Refrigerant
Sensor Fail
• MT6210 mitigation controller has detected a A2L refrigerant
sensor malfunction and one or more of the sensors need to
be replaced.
• If the MT6210 does not indicated a A2L refrigerant sensor
malfunction or no MT6210 mitigation controller is present,
5VDC is not detected at H1-5 but 12VDC is detected at
H1-3 12V_A2L input. Check connection at this terminal.
• The fan will be forced to run at High Speed in this condition.
Low Voltage Brownout
LED Activity Type Color Description
1 Flash Fault Yellow Compressor Low Voltage Brownout
• Conrm the low voltage supply is between 19-32VAC
at the H1 terminal of the MT2300 main board. If the low
voltage supply is out of range, verify the unit supply voltage
matches the nameplate voltage and the correct transformer
primary wire has been selected.
Freeze Fault Detect
LED Activity Type Color Description
2 Flash Fault Yellow Freeze Fault Detect (FFD)
• Low leaving water temperature (below 35°F standard range
or 13.5°F extended range)
Control Temp Sensor Failure
LED Activity Type Color Description
3 Flash Fault Yellow Control Temp Sensor Fail
• Room sensor control units only (MT2300 conguration
switch SW6 is ON).
• Check connection of space temperature sensor on MT2300
terminal TB2 pins 4 (RM) and 5 (GND) and return air
temperature sensor on MT2310 terminal H4 pins 3 (GND)
and 4 (RAT).
• Check resistance of space sensor and return air sensor. All
sensors are 10kohm thermistor at 77°F.
Entering Water Temp Sensor Fail (Boilerless
Electric Heat, Hydronic Heat or Waterside
Economizer Only)
LED Activity Type Color Description
4 Flash Fault Yellow Entering Water Temp Sensor Fail
• Check connection of entering water temperature sensor on
MT2310 I/O expansion board terminal H4 pins 1 and 2.
• Check resistance of the entering water temperature sensor.
All sensors are 10kohm thermistor at 77°F.
Leaving Water Temperature Sensor Failure
LED Activity Type Color Description
5 Flash Fault Yellow Leaving Water Temp Sensor Fail
• Freeze Fault Detect enabled (MT2300 conguration switch
SW4 is ON).
• Check connection of leaving water temperature sensor on
MT2300 terminal H2 pins 1 (LWT) and 2 (GND).
• Check resistance of leaving water temperature sensor. All
sensors are 10kohm thermistor at 77°F.
Relative Humidity Sensor Failure
LED Activity Type Color Description
6 Flash Fault Yellow Relative Humidity Sensor Fail
• Relative Humidity Sensor Failure alarm has been enabled
via network communications and the sensor is reporting out
of range.
• Check connection of relative humidity sensor on MT2310
terminal TB1 pins 1 (REF) and 2 (RH).
• Check that relative humidity sensor has power.
• Check voltage output from relative humidity sensor (0-
10VDC, 0-100% RH)
Condensate Overow
LED Activity Type Color Description
7 Flash Fault Yellow Condensate Overow
• Poor condensate drain.
• Check the resistance to ground on condensate wire. This
should be open if there is no water in the pan.
Emergency Shutdown
LED Activity Type Color Description
Rapid Flash Mode Green Emergency Shutdown
• Verify the E terminal is not connected to common. Remove
wire, if connected, and LED should change to solid green
only (Occ, Bypass,Standby modes).
Occupied, Bypass, Standby Modes: Heating/
Cooling/Fan Only/Dehumidication
LED Activity Type Color Description
1 Flash Mode Green
No Call for Heating / Cooling /
Dehumidication
2 Flash Mode Green Call for Cooling
3 Flash Mode Green Call for Heating
4 Flash Mode Green Call for Fan Only
6 Flash Mode Green Call for Dehumidication
• Unit is operating normal. It may currently have a control
signal or ready to operate when a control signal is active.
Unoccupied Mode
LED Activity Type Color Description
5 Flash Mode Green Unoccupied Mode Active
• Terminal U on main control board is connected to common
from external source or commanded by network.