Today I arrived on site to address the issue of the boiler not working, which is part of the heating system. Troubleshooting & Repair: Identified a loose wire at the control module. Fixed the loose wire at the control module. Completed the necessary work on the boiler. When arriving at the client's property. The client explained to me that a technician had previously verified the system. I proceeded to verify the unit, I found the system off. I proceeded to verify the wiring of the unit. I found a loose wire in the boiler's control module. I pressed and secured the connections of the unit. The boiler began to operate normally. I monitored the boiler for a few minutes. Minutes later I found that the PRV was leaking water, indicating a high water pressure in the system. I showed him and explained to the client the situation with the water leak from this system. I showed the customer that the EXP-90 was installed behind the boiler and there is no way to replace that EXP-90. T