Friedrich WallMaster WCVT12B30A Handleiding (90 Pagina's)

Handleiding

63 63

TROUBLESHOOTING

Diagnostic Codes

DIAG

CODE

PROBLEM DESCRIPTION CORRECTIVE ACTION

12

Discharge Air greater than

185°F.

Unit Shuts down electric heater. When

discharge air temperature is less than 100°F.

operation resumes.

13

High Pressure Switch Open. Unit shuts down compressor. Operation

resumes after lockout time and pressure

switch closes.

1. With unit power off, disconnect terminal pins of HPS1 and

ohm check to see if circuit is open.

2. If open replace HP switch.

3. If closed check for restriction in refrigeration system

causing high pressure.

14

Discharge Air Temperature

Sensor is Open or Shorted.

Unit overrides sensor and sets temp to 75°F.

Check for open or shorted temp sensor. Refer to Appendix for

temp. sensor values.

15

Inverter communication lost. No communication with inverter board 1. Check wiring from UI to inverter board.

2. Replace UI and cable.

3. Replace Inverter board.

16

Temperature Beyond Operating

Limits.

Ambient temp is less than 0°F or greater than

130°F. Unit turns off compressor, electric

heat, and fan. Operation resumes after fault is

cleared.

Do not operate unit outside of maximum conditions.

22

Outdoor Coil Temperature less

than 30°F for 2 consecutive

Minutes .

Only applicable to units with heat pump

and electric heat. Unit turns off heat pump

operation. Uses electric heat to satisfy all

heating demands. Cleared when outdoor coil

temp is greater than 45°F.

23

Frost Protection. Only applicable to heat pump only units. Active

when Heat Pump run time exceeds 60 minutes

with the outdoor coil temp less than 26°F.

Runs active defrost for up to 6 minutes.

Figure 603

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