Service by brand
Eaton and Powerware UPS repair
When the red alarm indicator of an Eaton UPS is lit, or the green indicator for normal operation is not, Eaton's 93PS guide tells the site team to call service. We diagnose and repair Eaton three-phase systems across Canada, current and discontinued, Powerware-badged units included, and quote the part before it is fitted.
Key facts
- Red alarm indicator lit: contact your service representative (93PS guide)
- Mature phase: best efforts, parts may be limited, replacement recommended (Eaton EOSL table)
- Retired phase: time and material services available (Eaton EOSL table)
- Warranty period: 12 months from the original date of purchase (93PS guide)
Faults we repair
- Battery faults: a string that fails its test, a block that runs hot or swells, runtime well below what the load needs.
- Rectifier and charger faults: the UPS will not recharge the batteries or will not return to normal after an outage.
- Inverter and power module faults: a module out of service, reduced capacity, loss of redundancy.
- Unit stuck on bypass: the load is on utility power with no battery backup until the cause is cleared.
- Fans and overheating: a fan failure, blocked air intakes, a hot room.
- Overload and emergency power off events: what tripped, and whether the load or the wiring needs attention before restart.
- Network and communication cards: lost monitoring or shutdown signals.
Before the technician arrives
- Note which indicators are lit and the alarm text on the display.
- Check whether the load is on inverter, on battery or on bypass, and how much runtime is left if it is on battery.
- Do not reset the unit repeatedly or open the cabinets: a battery string stays energized even with its breaker open.
- Have the model and serial number, and tell us what changed before the alarm: an outage, a generator test, new load.
How a repair visit works
We read the event log, take measurements on the batteries and the power path, find the failed part, and quote the repair before fitting anything. After the repair, the UPS is tested back to normal operation and you get a written report of the fault, the part and the readings.
When the fault is the battery string, the work follows the steps on the battery repair page, and replacement blocks for Eaton cabinets are sourced through the Eaton battery collection.
Repairing discontinued Eaton units
Eaton publishes a service phase for each model in its End of Service Life master table. In the Mature phase, Eaton's own definition is best efforts: parts may be limited and product replacement is recommended. In the Retired phase there is no contract coverage from Eaton, but time and material services are available and preventive and battery services may be. A unit in either phase can still be maintained, and that is where most of our work on older Eaton and Powerware equipment sits.
For a 9390, a 93E or a BladeUPS, a repair still makes sense while parts and batteries can be sourced. When it no longer does, we quote a replacement next to the repair: UPS end of life and replacement.
When Eaton should do the work
Eaton's 93PS guide gives a warranty of twelve months from the original date of purchase, with repair or replacement made by Eaton or by a service provider Eaton approves, so a unit in that period goes to Eaton. Battery aging is a maintenance matter: the guide states that batteries are covered against failures in material and workmanship, not against normal aging.
Coverage
Same-day service in Montreal, Quebec City, Toronto and Ottawa; 24 to 48 hours elsewhere in Canada. We reply and quote within 4 business hours. Tell us the brand, the model and the symptom or the visit you need, and the quote comes back with the scope and the date.
Preventing the next fault: Eaton preventive maintenance. All Eaton service: Eaton and Powerware UPS service. APC units: APC UPS repair.
Our UPS services
Service by brand
Related pages
Common questions
What does the red alarm light on an Eaton UPS mean?
That the UPS has an alarm condition. Eaton's 93PS guide tells the site team to contact service when the red alarm indicator is lit or the green indicator for normal operation is not. Note the display text before you call.
Can you repair a discontinued Eaton 9390 or BladeUPS?
Yes, while parts and batteries can be sourced. Eaton's End of Service Life table keeps time and material services available even for Retired models.
The UPS is stuck on bypass. Is the load protected?
It is powered, but by the utility alone, with no battery backup. Book a repair quickly and avoid planned work on the electrical supply until the UPS is back on inverter.
Do you repair Powerware units?
Yes. Older Powerware-badged systems are repaired the same way as current Eaton models.
How fast can you come?
Same-day service in Montreal, Quebec City, Toronto and Ottawa; 24 to 48 hours elsewhere in Canada. We reply and quote within 4 business hours.
Sources, checked October 4, 2026:
- Eaton, 91PS/93PS 8 to 40 kW user's and installation guide P-164000493, pp. 110, 118
- Eaton, UPS end of service life master table PL161010EN (revision 05/29/2026), p. 1
Send us the details
Fill this in and your own mail client opens with everything already written out. Nothing is sent from this site.
Brand names are trademarks of their owners and are used only to identify the equipment we service. We are not the manufacturer and are not affiliated with it.