Friedrich WallMaster WCVT12B30A handleiding

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Friedrich

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Handleiding

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Problem Possible Cause Possible Solution

Unit short cycles

Defective thermistor Replace thermistor or electronic control board

Unit oversized See sizing chart. Correct as needed.

Chassis seal gasket not sealing or ab-

sent causing unit to short cycle

Check gasket. Reposition or replace as needed

Restricted coil or dirty ﬁlter

Clean & advise customer of periodic cleaning & maintenance needs of entire

unit

Prolonged off cycles

Defective indoor ambient thermistor or

electronic control board

Check alarms. Replace thermistor or electronic control board

Outside water leaks

Evaporator drain pan cracked or ob-

structed

Repair, clean or replace as required

Obstructed condenser coil Use pressure wash or biodegradable cleaning agent to clean

Fan blade/ slinger ring improperly

positioned

Adjust fan blade to 1/2” of condenser coil ﬁn pack

Room temperature uneven

(Heating cycle)

Bad indoor ambient thermistor Check diagnostic codes. Check Thermistors. Replace as needed.

Fan speed too low Set at higher fan speed.

Does not heat adequately

Exhaust or fresh air door open Check if operating properly. Instruct customer on proper use of control

Dirty ﬁlter Clean (See Routine Maintenance)

Unit undersized

Check heat rise across coil. If unit operates efﬁciently, check if insulation can

be added to attic or walls. If insulation is adequate, recommend additional

unit or larger one

Heater hi-limit control cycling on & off Check for adequate fan air across heater. Check for open hi-limit control.

Shorted or open supplementary heater Do ohmmeter check.

Incorrect wiring Check applicable wiring diagram

Unit cools when heat is called

for

Incorrect wiring Refer to applicable wiring diagram

Defective solenoid coil Check for continuity of coil

Reversing valve fails to shift

Block condenser coil & switch unit to cooling. Allow pressure to build up in

system, then switch to heating. If valve fails to shift, replace valve.

Cooling adequate, but heating

insufﬁcient.

Reversing valve failing to shift com-

pletely; bypassing hot gas

De-energize solenoid coil, raise head pressure, energize solenoid to break

loose. If valve fails to make complete shift, replace valve.

TROUBLESHOOTING

Troubleshooting Tips

Figure 606

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