Carrier 101 Series Service And Maintenance Instructions

Is circuit breaker closed? Close door switch and go to start.Is red LED status light on? Is door switch closed?
Is red LED status light blinking rapidly without a pause?
Is there 115v going to switch? Replace door switch.Replace control. Replace transformer.
Is red LED status light blinking ON/OFF slowly with a combination of short and long flashes?
Check for correct line voltage polarity. If units are twinned, check for proper low-voltage  (24v) transformer phasing.
Check for previous status code by  momentarily shorting the TEST terminal and the Com 24-V terminal until the LED goes out. LED will flash the status code of any previous fault or the code No. 11 (1 short and 1 long flash) if no previous fault. After the control repeats the code 3 times, the control will go through a brief component test sequence. The inducer will start and run for the entire component test. The HSI, blower motor heat speed, and blower motor cool  speed will run for 10-15 sec each.
Determine status code. The status code is a 2 digit number with the first digit determined by the number of short flashes and the second digit by the number of long flashes. Once status code is determined, the control will go through a brief component test sequence. The inducer will start and run for the entire component test. The HSI, blower motor heat speed, and  blower motor cool speed will run for 10-15 sec each.
Was there a previous status code other than No. 11?
Does control respond to W, Y, or G 24-vac thermostat signals?
Go to section with status code determined.
Is there 115v between L1 and L2?
Close circuit breaker and go back to start.
Check for continuity in wire from circuit breaker to furnace.
NO
NO
NO
NO
NO
NO
YES
YES YES
YES YES
YES
YES
NO
NO YES YES
YES
START
Is there 24v between SEC-1 and SEC-2?
NO
Is 24 vac present at W, Y, or G terminals on the control? Replace control if it does not respond to 24-vac signal at W, Y, or G screw terminals. Check room thermostat or interconnecting cable.
YES NO
NO
TROUBLESHOOTING GUIDE
Run system through a heating or cooling cycle to check operation. Status codes are erased after 48 hrs or whenever power (115v or 24v) is interrupted. If blower on delay and inducer post-purge times are 60 sec and 15 sec, respectively (instead of 45 sec and 5 sec), remove jumper between pins 6 and 9 of 9-pin harness connector. Shorter times are for best reliability of non- condensing furnaces.
8

Carrier 101 Series Specifications

General

Brand	Carrier
Model	101 Series
Category	Furnace
Language	English