Why Isro's EOS-03 Satellite GSLV Cryogenic Engine Launch Failed ?

Why Isro’s EOS-03 Satellite GSLV Cryogenic Engine Launch Failed ?
ISRO’s GSLV rocket on Thursday failed to inject into the orbit, the country’s latest earth observation satellite EOS-03 due to a failure to ignite the cryogenic stage of the launch vehicle, prompting the premier space agency to declare the mission could not be achieved as intended. However, the first and second stages of the rocket had performed normally, the Bengaluru-headquartered Indian Space Research Organisation said.
EOS-03, part of the new generation of earth-observation satellites, was meant to provide almost real-time images of large parts of the country that could be used for monitoring of natural disaster like floods and cyclones, water bodies, crops, vegetation and forest cover.

Several other missions involving GSLV rockets are planned for this and next years, and their current schedules are likely to get impacted by this failure.
“Performance of first and second stages was normal. However, Cryogenic Upper Stage ignition did not happen due to technical anomaly. The mission couldn’t be accomplished as intended,” ISRO said in a statement, without giving any further details.
The cryogenic upper stage has an indigenously developed cryogenic engine fuelled by liquid hydrogen and liquid oxygen at very low temperatures. The cryogenic stage is supposed to be much more efficient and provides greater thrust to propel heavier rockets like GSLV that are designed to carry bigger payloads into space. But these are also much more complex than conventional liquid and solid propellants, because of the extremely low temperatures, hundreds of degree Celsius below zero, that has to be maintained. ISRO has had a few difficulties with the cryogenic stage earlier as well, though several launches have been completed successfully as well.

This was the 14th launch involving a GSLV rocket and fourth failure. This rocket, the Mark-II version of GSLV, was last used to successfully launch GSAT-7A, a communication satellite, in December 2018. The last failure of this rocket had happened way back in 2010.
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Why Isro's EOS-03 Satellite GSLV Cryogenic Engine Launch Failed ?

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