SPIRAL2 aims at building a multi-purpose facility at GANIL in Caen, France [1]. It will be dedicated to nuclear physics studies, including the production of rich-neutrons isotopes. The multi-beam linear accelerator is composed of superconducting accelerating modules operating at 4.5K and warm focusing magnets. IPN Orsay is in charge of the seven high energy (Type-B) accelerating modules, each hosting two superconducting 88 MHz quarter-wave resonators made of bulk Niobium operating at an accelerating gradient of 6.5 MV/m (β=0.12). The first Type-B series cryomodule has been validated in April 2013. Since then, four additional cryomodules have been validated in a row showing a very high-quality and reliable assembly procedure. Some of encountered problems (tuner hysteresis, magnetic shielding,...) and associated solutions will be presented. Moreover, a comparison of cavity performances between vertical cryostat and cryomodule tests will be done. INTRODUCTION The superconducting linac is now in its installation phase [2]. Five cryomodules out of seven of the high beta section have been validated in a row in terms of cryogenic and RF performances since April 2013. This systematic validation, proof of the high quality of cavity preparation and assembly procedure, is following a very long and intense period of troubleshooting (first series cryomodule tested in October 2010). First, several issues caused a significant degradation of the cavity performances compared to these obtained in vertical cryostat. Magnetic shielding, cavity and power coupler preparations had to be enhanced in order to meet the requirements meaning less than 10W (Qo > 1.37 E+09 at 4.2K) of RF dissipations at the operating gradient of 6.5 MV/m and a maximum gradient of at least 8 MV/m. Secondly, the innovative tuning system by movable superconducting plunger had to be improved mechanically. Indeed, while tested at cryogenic temperature, a significant hysteresis was measured on the cavity frequency when the plunger was moved by the stepper motor. After a summary of the performances of the five validated cryomodule, all issues encountered as mentioned previously will be explained as well as the technical solution applied. CRYOMODULE TESTING This section will describe most of RF tests done to perform the cryomodules validation. Power Coupler Conditioning The Spiral2 power couplers have been designed at LPSC in Grenoble, France. These are cleaned and assembled at LPSC and RF conditioned in standing wave at room temperature up to 20 kW in CW [3] before shipping to IPN Orsay for cryomodule assembly. Once the cryomodule fully assembled and ready for cool down, RF tests begin with two RF conditioning of the power couplers in open loop, first at room temperature and then at 4.2 K, out of cavity resonance (usually 88.0 MHz) and at a power up to 6 kW in CW. All couplers show in a very reproducible way multipacting events (vacuum deterioration and current measured on a polarized pick-up antenna installed close to the ceramic windows) for low forward power between 80 and 150 W. This behaviour is very similar to what is observed at LPSC. Once conditioned with increasing duty cycle (1, 5, 10, 25, 50% and CW), nothing else has to be reported. Cavity RF Conditioning The cavity RF conditioning starts first with the processing in closed loop (self-oscillating loop) of lowlevel multipacting barriers between 10 and 30 kV/m and another between 1 and 1.3 MV/m. These are usually processed within an hour by RF pulses of 1 kW at around 5 Hz at a duty cycle below 5 %. Some X-rays events of tens of μSv/h and helium flow bursts are measured while processing the 1 MV/m barrier. For all cavities tested in cryomodules, the accelerating gradient has been ramped up in CW up to 6.5 MV/m with no difficulties.