Friedrich CP14N10 用户手册

14

Unit does not run

Fuse blown or circuit tripped

Replace fuse, reset breaker. If repeats, check fuse 
or breaker size. Check for shorts in unit wiring & 
components

Power cord not plugged in

Plug it in

System switch in  "OFF" position

Set switch correctly

Inoperative system switch

Test for continuity in each switch position

Loose or disconnected wiring at switch or other 
components

Check wiring & connections. Reconnect per wiring 
diagram

Evaporator coil 

freezes up

Dirty fi lter

Clean as recommended in Owner's Manual

Restricted airfl ow

Check for dirty or obstructed coil. Use pressure 
wash or biodegradable cleaning agent to clean

Inoperative t-stat

Test for shorted t-stat or stuck contacts

Short of refrigerant

De-ice coil & check for leak

Inoperative fan motor

Test fan motor & replace if inoperative

Partially restricted capillary tube

De-ice coil. Check temp. differential (delta T) across 
coil. Touch test coil return bends for same temp. 
Test for low running current

Compressor runs 

continually & does not 

cycle off

Excessive heat load

Unit undersized. Test cooling performance & replace 
with larger unit if needed

Restriction in line

Check for partially iced coil & check temperature 
split across coil

Refrigerant leak

Check for oil at silver soldered connections. Check 
for partially iced coil. Check split across coil. Check 
for low running amperage

T-stat contacts stuck

Check operation of t-stat. Replace if contacts 
remain closed.

T-stat incorrectly wired

Refer to appropriate wiring diagram

T-stat does not turn 

unit off

T-stat contacts stuck

Disconnect power to unit. Remove cover of t-stat & 
check if contacts are stuck. If so, replace t-stat

T-stat set at coldest point

Turn to higher temp. setting to see if unit cycles off

Incorrect wiring

Refer to appropriate wiring diagrams

Unit undersized for area to be cooled

Refer to industry standard sizing chart

Cooling Only Room Air Conditioners: Troubleshooting Tips