TM 9-2320-364-20-3 2-1926 2.  CTIS INOPERATIVE (CONT). 2. Replace circuit breaker (Para 7-16). Verify repair, go to Step 11 of this Fault. YES NO Heater operates indicating 24   vdc are input to circuit breaker   CB17. System air pressure greater   than 110 psi (758 kPa). CTIS lines and components   not leaking. No lights illuminated on   controller. CTIS wire harness connections   OK. Voltage regulator faulty. CTIS protection device faulty. Circuit breaker CB17 faulty. Wire 1880 faulty. Wire 1435 faulty. CTIS controller faulty. Wire 1065 faulty. Front manifold faulty. Wire 1064 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If 22 to 28 vdc are not present at wire 1880, circuit breaker CB17 is faulty. WARNING 3. Voltage Regulator faulty (Para 7-6) or (Para 7-8). YES NO Heater operates indicating 24   vdc are input to circuit breaker   CB17. System air pressure greater   than 110 psi (758 kPa). CTIS lines and components   not leaking. No lights illuminated on   controller. CTIS wire harness connections   OK. Voltage regulator faulty. CTIS protection device faulty. Circuit breaker CB17 faulty. Wire 1880 faulty. Wire 1435 faulty. CTIS controller faulty. Wire 1065 faulty. Front manifold faulty. Wire 1064 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If more than 30 vdc are present at wire 1880, voltage regulator  is faulty. Are 22 to 28 vdc measured on wire 1880 at circuit breaker CB17? Is less than 30 vdc measured on wire 1880 at circuit breaker CB17? Read   WARNING on Page 2-1927