I am doing fault simulation by FaultModels in EnergyPlus. I found two fault models are not working correctly: FaultModel:TemperatureSensorOffset:OutdoorAir, FaultModel:TemperatureSensorOffset:ReturnAir. My baseline model is from the reference building library(fault-free, ASHRAE90.1_MediumOffice_STD2013_Chicago), with simulated total source energy: 5890.77GJ

fault1: OA sensor offset; i vary the sensor offset to be 0, 1, 2, 5, 8, degreeC The simulated total source energy: 5884.79GJ, for all offset values (EnergyPlus V8.8). But for EnergyPlus V8.7, the simulated total source energy: 5890.77GJ, for all offset values. (The same to fault-free model)

fault2: RA sensor offset; i vary the sensor offset to be 0, 1, 2, 5, 8, degreeC The simulated total source energy: 5884.79GJ, for offset values (EnergyPlus V8.8). But for EnergyPlus V8.7, the simulated total source energy: 5890.77GJ, for all offset values. (The same to fault-free model)

I am sure the setup is correct for all cases. How to solve such issue? Thanks.