Carrier 19XL - Manual (Page 243)

If problem is still not resolved, consult the starter manufacturer for servicing.
Testing Silicon Control Rectifiers (SCRs) in Cutler-Hammer® Solid-State Starters
To check for a shorted SCR refer to Steps 1-3 and Figure 47 , Figure 48 , and Figure 49 .
Note: Do not megger (high voltage insulation test) the starter.
1. Connect ohmmeter across terminals L1 and T1. Check the resistance reading. Resistance
reading should be greater than 10,000 ohms.
2. Connect ohmmeter across terminals L2 and T2. Check the resistance reading. Resistance
reading should be greater than 10,000 ohms.
3. Connect ohmmeter across terminals L3 and T3. Check the resistance reading. Resistance
reading should be greater than 10,000 ohms.
If the SCRs tested were not defective, but the problem persists, refer to Steps 4-8.
CAUTION CAUTION
!
Damage to the starter may result if wires are reversed.
Click here for Figure 46 — Typical Benshaw, Inc. Solid-State Starter (Internal View)