BMC Heat Pump GTA3600UD1AA User Manual

Manual 2100-537

I

 

Page 

46 of 54

Manual

2100-537G

Page

44 of 52

Heat

Gen.

Power Failure

Blown Fuse or Tripped Breaker

Faulty Wiring

Loose Terminals

Low Voltage

Defective Contacts in Contactor

Compressor Overload

Potential Relay

Run Capacitor

Start Capacitor

Faulty Wiring

Loose Terminals

Control Transformer

Low Voltage

Thermostat

Contactor Coil

Pressure Controls (High or Low)

Indoor Blower Relay

Discharge Line Hitting Inside of Shell

Bearings Defective

Seized

Valve Defective

Motor Wingings Defective

Refrigerant Charge Low

Refrigerant Overcharge

High Head Pressure

Low Head Pressure

High Suction Pressure

Low Suction Pressure

Non-Condensables

Unequalized Pressures

Solenoid Valve Stuck Closed (Htg)

Solenoid Valve Stuck Closed (Clg)

Solenoid Valve Stuck Open (Htg or Clg)

Leaking

Defective Valve or Coil

Plugged or Restricted Metering Device (Htg)

Scaled or Plugged Coil (Htg)

Scaled or Plugged Coil (CLg)

Water Volume Low (Htg)

Water Volume Low (Clg)

Low Water Temperature (Htg)

Plugged or Restricted Metering Device (Clg)

Fins Dirty or Plugged

Motor Winding Defective

Air Volume Low

Air Filters Dirty

Undersized or Restricted Ductwork

Auxillary Heat Upstream of Coil 

Compressor 

W

il

l Not Run    

       

     

No Pow

er at Contact

or













Compressor 

W

il

l Not Run    

       

Pow

er at Contactor













Compressor 

"Hums

"   

       

       

       

But W

ill Not 

Start















Compressor 

Cyc

les on Ov

erload

































Thermost

at Check

 Light

       

       

    

Lite-Lock

out 

Relay



Compressor 

Off on High  

       

    

Pressure Control





















Compressor 

Off on Low

    

       

Pressure Control















Compressor 

Noisy





Head Pressure T

oo High



















Head Pressure T

oo Low











Suction P

ressure Too High







Suction P

ressure Too Low





















I.D. Blow

er W

ill Not

 Start











I.D. Coil 

Frosting or Ic

ing











High Compress

or Amps



























Ex

cessiv

e W

ater Us

age





Compressor 

Runs Continuously

  

    

–  No Cooling















Liquid Refrigerant Fl

ooding Back

 

 

To Compres

sor









Compressor 

Runs Continuously

  

    

–  No Heating













Rev

ersing Valv

e Does

 Not Shift







Liquid Refrigerant Fl

ooding Back

 

 

To Compres

sor











Aux

. Heat on I.

D. Blow

er Off











Ex

cessiv

e Operati

on Costs



















Ice in W

ater 

C

oi

l











            Heating Cycle

A

UX.

Cooling 

Cycle

                                             Heating or Cooling Cycles

I

n

door Blower 

M

otor 

and  Coi

l

INDOOR SECT

ION

POW

ER SUP

PLY

W

ater 

S

olenoid

R

ev

. 

Valv

e

W

ater Coi

l

W

A

T

E

R COIL SE

CT

IO

N 

Line V

oltage

Control Ci

rcuit

Compressor

Refri

gerant Sy

stem

QUICK 

REFERENCE 

TROUBLESHOOTING 

CHART 

FOR 

WATER 

TO 

AIR 

HEAT 

PUMP



Denotes 

common 

cause



Denotes 

occasional 

cause