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CVHE-SB-32A 21

~ Stepper module must be X-13650455-04 or newer.

14 Starter module X-13650453-13 and greater have a less sensitive MPL diagnostic trip point.

Problem 49: Motor winding temperatures changing rapidly and randomly.

Corrective Action:

1 Electrical noise problem in the Circuit module. X-13650451-04 Rev. D or later corrects the

problem by adding a filtering circuit.

Problem 50: Differential Oil Pressure Calibration Diagnostic following post lube. Second-

ary problem may be the oil pump will not shut off after post lube.

Corrective Action:

1 Diagnostics are active in all non-running modes and the unit has been off for 5 minutes. The

UCP2 calibrates the oil pressure sensors and if an error is found greater than 3 PSID a

diagnostic is called out.

~ Sensors

~ Changing system pressures caused by such things as a pressure or changing water temper-

atures.

2 If the oil pump is running and will not shut off in post lube, the problem is a wiring error on the

Starter module. One or both of the following apply.

~ 115 VAC is connected to terminal J6-3 of the Starter module. Check to see if it was con-

nected incorrectly to Terminal J3-1.

~ Terminal J8 on the Starter module. J8-1 (Wire #13) goes to the 2K1 Contactor. J8-2 (Wire

#15) goes to 2K1 Auxiliary. Check to see if Wire #13 and Wire #15 are reversed.

Problem 51: Differential Oil Pressure

On Circuit module revision X-13650451-13 and newer, has a positive oil pressure

trip at 2/3 the setpoint with a default setpoint 12 psig and a minimum of 9 psig

setpoint.

Corrective Action:

1 The Circuit module was clearing the 3 minute oil pressure establish timer during a remote

RESET. This would result in an Oil Pressure Overdue diagnostic. (Exists for Circuit modules

X-13650451-06 and earlier).

2 Faulty oil pump motor.

3 Faulty 1F2 fuse.

4 Faulty Circuit module relay output.

5 Faulty oil pump capacitor.

6 Faulty oil pump sensor and/or wiring.

7 Clogged oil filter.

8 Faulty oil pressure regulator.

9 Differential oil pressure when the unit is off. The unit sees current due to Feedback via the

PFCCs or CTs. We get a starter interrupt failure. The UCP2 thinks the motor is running and

brings on the oil pump and logs differential oil pressure diagnostics.

Trane CVHG Troubleshooting

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