Zehnder Rittling VS Series Installation, Operation And Maintenance Manual page 60

Troubleshooting
PCB System Error Codes
(Green LEDs)
Warning = FLASHING
Lock-out = STEADY
LD1 LD2 LD3
OFF OFF OFF
X
OFF OFF
X
OFF OFF
X
OFF OFF
X
OFF OFF
X X
OFF
X
OFF OFF
X
OFF OFF
X X
OFF
X X
OFF
58
System
Error
Code Fault Description
(COM
T Stat)
LD4
High pressure lockout
X
Er 1
> 600 PSI
Low pressure lockout
OFF Er 2
< 40 PSI
Freeze protection,
X
Er 4
water side
Freeze protection,
OFF Er 5
air side, < 35°F
Er 9,
X
Condensate overflow
Er 10
Over/under low voltage
X
Er 11 protection
16VAC > voltage > 30VAC
OFF Er 13 LWT sensor failure
X
Er 14 DAT sensor failure
OFF Er 15 FP1 sensor failure
X
Er 16 FP2 sensor failure
Potential Causes
Low air flow (heating), low water flow (cooling)
■
■
Blower fan inoperable (heat mode)
■
■
Dirty air filter (heat mode)
■
■
Airflow by-passing air coil through due to poor sealing of
■ ■
cabinet openings (heat mode)
Return air too hot (heat mode)
■
■
Air in risers (cool mode)
■
■
Dirty water strainer (cool mode)
■
■
Faulty zone valve (cool mode)
■
■
Mis-wired zone valve (cool mode)
■ ■
Ball valves closed (cool mode)
■
■
Main water pump inoperable (cool mode)
■
■
Supply water too hot (cool mode)
■
■
Low refrigerant charge
■
■
Blower fan inoperable (cool mode)
■
■
Airflow by-passing air coil through due to poor sealing of
■
■
cabinet openings (cool mode)
Ball valves closed (heat mode)
■
■
Main water pump inoperable (heat mode)
■ ■
Water temperature < 35°F or < 15°F (heating)
■
■
DIP switch 2 incorrectly set
■
■
Air in risers (heat mode)
■
■
Ball valves closed (heat mode)
■ ■
Faulty zone valve (heat mode)
■
■
Main water pump inoperable (heat mode)
■
■
Dirty water strainer (heat mode)
■
■
Refrigerant charge quantity below factory recommendation
■
■
Blower failure (cooling)
■
■
Dirty air filter (cool mode)
■
■
Airflow by-passing air coil through due to poor sealing of
■
■
cabinet openings (cool mode)
Return air too cool (cool mode)
■ ■
Refrigerant charge quantity above factory recommendation
■
■
Clogged drain line
■
■
Condensate switch has residual water contacting from unit
■
■
installation/removal
Loss of power, brown-out
■ ■
Main power voltage not within acceptable range
■
■
Sensor wiring not properly connected
■
■
Sensor resistance above or below specification
■
■
Sensor wiring not properly connected
■ ■
Sensor resistance above or below specification
■
■
Sensor wiring not properly connected
■
■
Sensor resistance above or below specification
■
■
Sensor wiring not properly connected
■
■
Sensor resistance above or below specification
■
■