Pentair Tube Sheet Coil Assembly Replacement Kit | MasterTemp & Max-E-Therm 400 | 77707-0234 Spine Boards inspect the inlet fitting adapter

inspect the inlet fitting adapter threads and seating surfaces for chemical scale buildup — calcium deposits from chlorine tablets are common and can prevent a proper seal

Air intrusion issues are frequently caused by multiple small failures acting in combination — addressing them in a single service visit avoids repeat disassembly

Replacement Part for Fiberglass filters

8 hours: 60

Inspect the tank o-ring and manifold assembly during re-grid service

Pentair Tube Sheet Coil Assembly Replacement Kit | MasterTemp & Max-E-Therm 400 | 77707-0234 Spine Boards inspect the inlet fitting adapterThe Pentair Tube Sheet Coil Assembly Replacement Kit (77707 0234) is the replacement heat exchanger assembly for the Pentair MasterTemp 400 and Pentair Sta Rite Max E Therm 400 pool and spa heaters. IMPORTANT: HEATER COMPONENT PROFESSIONAL SERVICE REQUIRED Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high voltage components without proper