McQuay LIA266 User Manual

14
Symptom Remedy
No display Check for 24 VAC/VDC at thermostat; display is blank when 24 VAC/VDC is not present
System fan does not come
on properly
Verify wiring is correct
Check configuration (see “Configuration Mode,” Setting 2, Page 8)
See “Fan Test” (Page 11)
Thermostat turns on and
off too frequently
Adjust temperature differential (see “Temperature Differential,” “Configuration Mode,”
Settings 4 and 5, Page 9)
Fan runs continuously Check fan On/Auto switch, ON position runs indoor fan continuously
Room temperature is not
correct
Verify wall hole is plugged with putty or insulation; calibrate thermostat (see
“Configuration Mode,” Setting 10, Page 10)
ROOM displays Room temperature offset is not zero (see “Configuration Mode,” Setting 10, Page 10)
Status indicator Green light – Cooling operation
Red light – Heating operating
Status indicator option ON (see “Configuration Mode,” Setting 12, Page 10)
Er displays Sensor error – check S1 & S2 connections, check remote sensor wire and connections,
use shielded wire for remote sensor
Problem not listed above Press the Reset button once; display will be refreshed and anti-short cycle timing will be
reset to zero
Troubleshooting

McQuay LIA266 Specifications

General

Brand	McQuay
Model	LIA266
Category	Thermostat
Language	English