Pelpro PPC90 Service Manual page 23

CODE #3: AMBIENT PROBE ALARM
TEST POINT
AMBIENT
TEMP PROBE
AT ROOM TEMPERATURE, THE EXHAUST PROBE WILL READ AROUND 100K OHMS. AS HEAT
IS APPLIED TO THE PROBE, THE OHMS READING WILL CONTINUE TO GET SMALLER.
23 8390-017A 06/21