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KB Home / Equipment / PTAC / PTAC Diagnostic Codes

PTAC Diagnostic Codes

Article ID: 86
Last updated: 20 Mar, 2017

PTAC

Re: DIAGNOSTIC CODES

OPERATING MODES
Code Status Suggested Action
FP Freeze Protection engaged None
Fd Front Desk switch is closed Open Front Desk switch
Eo Un-Configured Board Enter configuration menu
EH Emergency Hydronic engaged Open front emergency hydronic switch
LS Load Shedding engaged Open load shedding switch
On Configured for Wired Stat None
oP Open Door Lockout Close room door switch
nP Window Switch Lockout Close door or window switch
hP Heat Sentinel Room temperature too high
Ur Un-Rented Status Front-desk need to set to Rented mode.
FAILURES
Code Status Suggested Action
F1 Indoor sensor out of range Replace Black indoor thermistor
F2 Wireless Remote Thermostat failure Replace wireless thermostat
F3 Indoor sensor out of range Replace Black indoor thermistor
F4 Indoor Coil sensor out of range Replace Red indoor coil thermistor
F5 Wireless Thermostat failure Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat
F6 Indoor Discharge sensor out of range Replace Yellow Discharge thermistor
Fb Low Remote Battery Replace batteries in wireless device
H1 High Voltage Protection Check incoming power
br Brown Out Protection Check incoming power
AIRFLOW ALERTS
Code Status Suggested Action
L6 Discharge air too hot Clean filter or remove air blockage
LC Outdoor coil temp high Clean condenser coil, check for fan fault
C2 Too much temp drop Clean filter, remove air blockage, close vent door
C5 Outdoor coil temp too high for ambient temp Check for blocked outdoor air, clean coil
REFRIGERATION ALERTS
Code Status Suggested Action
C1 Indoor coil too cold Clean filter, check fan, check charge
C4 Indoor coil froze-up Clean filter, check fan, check charge
C6 Poor unit performance Check blower, compressor & heaters
C7 ICT - IAT > 20 (+ 10 min) Clean filter, check fan, check charge

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Article ID: 86
Last updated: 20 Mar, 2017
Revision: 6
Access: Public
Views: 193
Comments: 0
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