Why UPS fail without maintenance
A UPS is electromechanical equipment with batteries, capacitors and fans that age. The most common cause of UPS failure is battery degradation — a string with one bad block can collapse under load, leaving you unprotected without warning. Dust, heat and failed fans cause overheating; capacitors drift over time. Without inspection and testing, these faults stay hidden until the moment you need the UPS and it does not deliver.
What a maintenance visit covers
A proper preventative visit includes visual inspection, electrical measurement, impedance testing of every battery block, thermal imaging of connections, firmware and alarm checks, and a runtime test. The engineer logs trends, replaces failing blocks early, and confirms the system will perform when called upon.
What a contract gives you
A maintenance contract adds predictable cost and guaranteed response:
- Scheduled visits (typically 1–4 per year) to catch issues early.
- Guaranteed response times — from next-business-day to 24/7 critical cover.
- Priority parts and labour, often discounted.
- Remote monitoring so faults are flagged before you notice them.
- Battery replacement programmes to keep strings within life.
See our maintenance contracts and battery replacement services.
Choosing a response level
Match the contract to your risk. A home office may need return-to-base repair; a data centre needs 24/7 on-site response within hours. The cost of a contract is small compared to the cost of an unprotected failure — and far smaller than the downtime it prevents.
Frequently asked questions
How often should a UPS be serviced?
At least annually for office UPS, and 2–4 times a year for critical or large systems, with battery testing at each visit.
What is impedance testing?
A non-invasive test that measures the internal resistance of each battery block to identify degradation before it causes a failure under load.
What response time should my maintenance contract guarantee?
Match it to your risk: next-business-day for offices, 24/7 on-site within hours for data centres and life-critical systems.
Is a UPS maintenance contract worth it?
For any critical load, yes. It catches battery and component failures early, guarantees response, and is far cheaper than the downtime it prevents.