Today I arrived on site to address the parts installation. Service Actions: Replaced the control module. Replaced the ignition assembly. Returned to replace parts for the heating and DHW systems. Upon arrival at the property, contact the client to inform him about today's visit. The client was waiting for me to install the recommended parts last Saturday. I proceeded to verify the system visually. The unit is failing due to the malfunction of the control module, ignition assembly and gas valve. The client provided me with the parts that will be installed on this day. The customer provided me with the new control module and ignition assembly. The client mentioned that the gas valve will not arrive until next week. I explained to the customer that it is necessary to replace the gas valve also since the short circuit of the control module has caused an internal circuit. The client gave me permission only to install the control module and the new ignition assembly he received. I