Short answer. Yes, if the repair is genuinely urgent. Article 92 of the Labor Code lets an employer require rest-day work in cases of urgent work to be performed on the machinery, equipment, or installation, to avoid serious loss which the employer would otherwise suffer. A routine, non-urgent repair does not fit this ground.
What the law says
In cases of urgent work to be performed on the machinery, equipment, or installation, to avoid serious loss which the employer would otherwise suffer
Labor Code, Article 92 — Work On A Rest Day. Read the full provision →
The machinery-repair ground, in its own words
Article 92 allows rest-day work in cases of urgent work to be performed on the machinery, equipment, or installation, to avoid serious loss which the employer would otherwise suffer. Repairing broken machinery is exactly the kind of situation this ground contemplates — but two words in it, urgent and serious, are doing the work of limiting it, not every repair job that happens to fall on a rest day.
Why 'urgent' rules out routine maintenance
The ground is about urgent work, which points to a repair that genuinely cannot wait for the next regular working day without consequence. Scheduled maintenance, a repair that could reasonably be deferred, or work that is simply more convenient to finish while the rest day is available does not carry the same urgency the article describes, even if it also involves machinery or equipment.
'Serious loss' is the other half of the test
The article also ties the ground to avoiding serious loss which the employer would otherwise suffer. A breakdown that would shut down production, damage other equipment, or cause significant losses if left unrepaired fits that description more clearly than a malfunction with a minor or easily absorbed impact. Both the urgency of the repair and the seriousness of the loss it prevents are part of what the ground requires.
What this means for a broken-machinery request
If your employer asks you to come in on your rest day to fix machinery, whether Article 92 supports that request turns on whether the repair is truly urgent and whether leaving it unaddressed would cause serious loss, not simply on whether machinery happens to be involved. A repair that could safely wait until your next scheduled workday sits outside what this specific ground authorizes. Article 92 does not exempt any category of employer from this test, and it applies whatever the size of the workforce affected. An employer who calls in staff on a rest day for machinery work that is neither urgent nor tied to serious loss has not satisfied this ground, regardless of how the request is framed.