Issue
Control trouble # 87 displays Battery Trouble.
Probable Cause:
- The battery failed a battery test
- The battery is defective
- The wiring to the battery is disconnected
Solution:
- If there has just been a power failure, wait a least 24 hours for the battery to recharge, then perform a system reset to re-test the battery and clear the error
- Replace the battery.
Check wiring.
