Carrier Series 100- Manuals

- 19 - Status Code 24 SECONDARY VOLTAGE FUSE IS OPEN - Indicates fuse is open and there is a short in low-voltage wiring. STEP ACTION YES NO GO TO 1. Turn power off and remove the blower access panel. 2 2. Is secondary voltage fuse blown? Check continuity to make sure. 5 3 3. Replace variable speed ...

- 21 - Status Code 25 MODEL SELECTION OR SETUP ERROR – If status code 25 only flashes 4 times on power-up the variable speed furnace control is missing its model plug (PL4) and is defaulting to the model selection stored in memory. If status code 25 flashes continuously it could indicate any of the ...

- 22 - Status Code 31 MEDIUM-HEAT PRESSURE SWITCH OR HPSR RELAY DID NOT CLOSE OR REOPENED - This status code can occur under the scenarios shown below. Keep in mind that whenever the variable speed furnace control shuts unit down, gas remains off or shuts off immediately, inducer continues running f...

- 24 - STEP ACTION YES NO GO TO 41. Did the pressure gradually drop over time until the fault occurred? If the pressure remained constant and then the fault all of sudden occurred go to step 50. 51 50 42. Check for a sag in vent pipe or partially clogged drain trap or line. Also check for improperly...

- 26 - Status Code 33 LIMIT CIRCUIT FAULT - This status code indicates the limit, or flame rollout switch is open or the furnace is operating in high-heat only mode due to 2 successive low or medium heat limit trips. Blower will run for 4 minutes at medium heat airflow or until the open switch remak...

- 28 - Status Code 34 IGNITION-PROVING FAULT - This status code indicates flame was not sensed during trial for ignition period. The control will repeat ignition sequence 3 more times before going to status code 14 - IGNITION LOCKOUT. This status code can also indicate flame signal was lost during s...

- 30 - Status Code 41 BLOWER MOTOR FAULT - This status code indicates the blower failed to reach 250 RPM or the blower failed to communicate to the variable speed furnace control within 30 seconds after being turned ON or within 10 seconds during steady-state operation. STEP ACTION YES NO GO TO 1. S...

- 32 - STEP ACTION YES NO GO TO 47. When blower control module is completely detached from blower motor, verify with standard ohmmeter that the resistance from each motor lead in motor plug to unpainted motor end plate is greater than 100k ohms. Then verify motor windings are not shorted or open by ...

- 34 - Status Code 43 LOW-HEAT PRESSURE SWITCH OPEN WHILE MEDIUM-HEAT PRESSURE SWITCH IS CLOSED - This status code can occur as a result of the low heat pressure switch LPS not making during a call for heat. Keep in mind that whenever status code 43 occurs the variable speed furnace control shuts un...

- 35 - CLEANUP AND START-UP INSTRUCTIONS 1. Start furnace using procedure outlined on Lighting Instructions attached to furnace. Observe operation of furnace through at least 1 complete heating cycle controlled from the room thermostat. Observe cycle for 20 minutes or until a status code is flashed....

- 46 - SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs...