7.1.9 Freeze protection 83
7.1.10 Boiler treatment 83
7.1.11 Relief valve - maintenance and testing 84
7.2 Replacing the fan, gas valve, and burner in EX 400 and EX 500 models 85
7.2.1 Replacing the fan on the EX 400 and EX 500 models 86
7.2.2 Replacing the gas valve in the EX 400 and EX 500 models 87
7.2.3 Replacing the burner in the EX 400 and 500 models 90
7.3 Replacing the fan, gas valve, and burner in EX 750 and EX 800 models 96
7.3.1 Replacing the fan on the EX 700 and EX 850 models 97
7.3.2 Replacing the gas valve in EX 700 and EX 850 models 98
7.3.3 Replacing the burner in the EX 700 and EX 850 models 100
7.4 Replacing the air filter 102
7.5 Cleaning a condensate trap 103
8.1 Preliminary checks 105
8.2 Electronic components 106
8.2.1 Temperature sensors 106
8.2.3 Air pressure sensor 107
8.2.4 Water pressure sensor 107
8.2.5 Gas pressure switches 108
8.2.6 Safety and Ignition Module (SIM) 108
8.3 Troubleshooting error messages 111
8.3.1 Touchscreen error messages 111
8.3.2 Maximum ignition trials error 112
8.3.3 Hi/Low gas pressure switch error 113
8.3.4 Hi Limit cut-off temperature error 113
8.3.5 Low Water Cut-off error 113
8.3.6 Aux. Interlock 1 or 2 113
8.4 Miscellaneous touchscreen controller errors 114
8.4.1 Ignition issues 115
8.4.2 Temperature issues 116
8.4.3 Miscellaneous issues 117
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