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Generac — Section 1.1

For these Generac models: CTTS STYLE CONTACTOR ASSEMBLY 600-2600 AMP, CTTS Style CONTACTOR Assembly (100-400 Amp), CTTS Style CONTACTOR Assembly (600-2600 Amp), CTTS Style Contactor Assembly, W Style CONTACTOR Assembly, Wn STYLE CONTACTOR ASSEMBLY 600-2600 AMP, Wn Style CONTACTOR Assembly (100-400 Amp), Wn Style CONTACTOR Assembly (600-2600 Amp).

Applies to: Generac Ctts Style Contactor Assembly 600 2600 Amp, Generac Ctts Style Contactor Assembly, Generac W Style Contactor Assembly, Generac Wn Style Contactor Assembly 600 2600 Amp

Procedure

  1. 1. Remove front cover.
  2. 2. Remove top PCB cover (see Figure 3).
  3. 3. For the purpose of testing, the PCB layout is as follows J1 J2 1 8 2 3 4 5 1 2 3 4 5 6 6 7 looking down)
  4. 4. If switch is not tripping to neutral, measure the resis­ tance between J1-6 and J1-8. The resistance of the trip coil should be measured, +/- 7%. If INFINITY is mea­
  5. 5. sured, replace the trip coil. If good, proceed to .
  6. 5. Measure ohms between AT2 (E2) and PCB J2-5. A resistance of 0.2 ohms should be measured. If INFINITY is measured, replace ATS1 upper limit switch (Part #
  7. 71345. . If good, measure the resistance between AT1

Source: manual:Generac GTS Trouble Shooting - 0H3949-A2.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.