Microtech 2300 - Troubleshooting the Water Source Heat Pump Unit

TROUBLESHOOTING
MICROTECH 2300 UNIT CONTROLLERDAIKIN APPLIED
20
Low Entering Water Temperature (Heating) (No
Display On Boilerless Electric Heat)
LED Activity Type Color Description
7 Flash Mode Green Low Entering Water Temp
• Verify entering water temperature is greater than set point.
HGR Low Return Air Temp Cutout
LED Activity Type Color Description
8 Flash Mode Green HGR Low Return Air Temp Cutout
• Unit is in the dehumidication mode and the return air
temperature is below 68°F.
Waterside Economizer Low Temp Cutout (WSE
Control & Call for Cooling)
LED Activity Type Color Description
9 Flash Mode Green WSE Low Temp Cutout
• Entering water temperature is below 45°F.
Troubleshooting the Water Source
Heat Pump Unit
Compressor runs in short cycle
• Check wiring - loose or broken and check for faulty
connection
• Check relays and contacts, also capacitor and wiring.
• Check high pressure switch, low pressure switch and low
temperature switch to see if unit is cycling on the safety.
• Check to see if the reversing valve is not hung up and is
operating correctly.
• Check condensate overow switch in cool/dehumidication
mode of operation.
• Check thermostat or room sensor for proper location
Neither fan, nor compressor runs and all LED
lights are o
• Unit control, check thermostat for correct wiring or faulty
thermostat.
• Wire may be loose or broken. Replace or tighten wires.
• Fuse may be blown, circuit breaker is open.
• Low voltage, check power supply voltage.
Fan operates, compressor does not
• For unit size 290, verify compressor protector fault status.
• Check wiring - loose or broken and check for bad
connection.
• High or Low pressure lockout
a. Cool mode, check water ow
b. Heating mode, check air ow
c. Check reversing valve for proper valve position
• Check compressor overload - make sure it is closed.
• Check compressor to ground, or for internal short to ground.
• Compressor winding may be open. Check continuity with
ohm meter.
Compressor attempts to start but does not
• Check compressor wiring for defective wiring or loose
connection.
• Check for defective compressor internal windings with ohm
meter.
• Check for faulty compressor capacitor.
• Check for lock rotor amp draw.
Insucient cooling or heating
• Check thermostat for improper location.
• Check for proper air ow - lter could be dirty.
• Check blower assembly for dirt or faulty fan motor capacity.
• Check for low refrigerant charge.
• Check amp draw on blower assembly.
• Check for proper water ow and delta T (°F).