10/30/25 - Completed a full heating maintenance on ten RTU’s. The filters were changed, the heat exchangers were checked, and proper operation was tested. First off, units 4 and 7 had loose AX58 belts, it would be recommended to replace them, but they were still functioning at this time. Next, unit 5 was not operating at this time, nothing would come on, no heat or blower. This could be a thermostat issue or a different electrical issue, it will need to be diagnosed further to determine the problem. Lastly, units 8 and 10 were both not heating at this time. They both would try to ignite, then nothing would happen, both units would then lock out after three failed ignition attempts. They will both need to be diagnosed further to determine the problem. Overall, these were the only issues found, all other units were in good condition, and they were running well at this time.