CSVB Series II - Columbia Heating

APPENDIX A - CONTROL MODULEA.6 Boiler High Limit Temperature Controller• When water temperature reaches setpoint, controllerends heating cycle.• When water temperature drops below setpoint minusdifferential, controller restarts heat cycle to re-heatboiler water.• If water temperature exceeds maximum allowedtemperature (220°F or 104°C), controller enters manualreset lockout state.• For models having reset capability, press any onboardbutton or cycle power to reset.Figure 18 - Basic Control Algorithm ExampleA.7 Troubleshooting• Following service procedures are provided as generalguide.• On lockout and retry models, meter readings betweengas control and ignition module must be taken withintrial for ignition period. Once ignition module shutsoff, lockout models must be reset through key buttonsand display. On retry models, wait for retry or reset atthermostat.• Check for correct installation and wiring before replacingany component.• Control module cannot be repaired. If it malfunctions, itmust be replaced.• Use only qualified service agent to service ignitionsystems.1. Perform checkout as first step in troubleshooting.2. Check troubleshooting guide to pinpoint cause ofproblem. See Table 8 , page 35.3. If troubleshooting indicates ignition problem, seeIgnition System Checks to isolate and correct theproblem.4. Perform checkout procedure following troubleshootingguide again to verify system is operating normally.A.8 Troubleshooting Error CodesIntegrated boiler control uses advanced diagnosticcapability to assist in troubleshooting error conditions.Table 8 shows codes that could arise on integrated displayduring fault.Suggestions are provided in Table 8 for servicing thesepotential errors.34