Hayward H-Series Millivolt Na Mv Pool Heater All models English - Page 37

SECTION 7. TROUBLESHOOTING Troubleshooting Chart: This chart may be used as a quick reference guide for maintenance and service problems. FOR QUALIFIED SERVICE PERSONNEL ONLY. PROBLEM POSSIBLE CAUSES REMEDY HEATER WILL NOT FIRE UP See Troubleshooting Procedure That Pertains To Your Heater, (Millivolt or Electronic Ignition). Time Clock Set Wrong. Reset Clock. Filter Is Dirty. HEATER CYCLING ON AND OFF CON- TINUOUSLY. External By-Pass Out Of Adjustment, (Where Used). Clean Filter. Adjust By-Pass. Pressure Switch Out Of Adjustment. Adjust Pressure Switch. High Water Flow Rates (Above 125 GPM). Reduce Flow Rate By Adding A Manual By-Pass Valve. Internal By-Pass Stuck Open. Check For Excessive Hardness Or Acidity That May Have Damaged Valve. Repair Or Replace. SOOTING OF THE HEAT EXCHANGER. Lack Of Air For Combustion. Low Fuel Volume. Provide Adequate Air. See Venting Installation. Correct With Proper Gas Line Sizing. Improper Venting. Provide By Proper Venting. See Section II. Burner Inlet Throat Blocked. High Pressure/Low Clean Burners Adjust Gas Pressure. Pressure. Collapsed Combustion Chamber. Replace Combustion Chamber. Low Gas Pressure. Increase Pressure. PILOT OUTAGE (MILLIVOLT ONLY) Restricted Gas Flow. Clean Pilot Orifice Or Tubing. Weak Thermopile. Replace Thermopile. JACKET SURFACE TEMPERATURES EXCESSIVE. Broken Refactory. Replace Refactory. By-Pass Valve Stuck Open. Inspect By-Pass Movement And Repair. LIME SCALE. Thermal Control Valve Not Working. Water Chemistry Out Of Balance. Check For Movement. Replace If Not Movement. See Section On Pool Water Chemistry. Unnecessary External Manual By-Pass Installed Close Manual By-Pass Valve And Re- Or Out Of Adjustment. move Or Adjust Properly. See Section on By-Pass Valve. Gas Line Too Small. Check Gas Pipe Size in Figure 20. Heater Too Small. Check Sizing Chart. Install Larger Heater If Necessary. HEATER WILL NOT BRING POOL TO DESIRED TEMPERATURE. Time Clock Is Set Incorrectly. Filter Not Cleaned Often Enough. Reset Time Clock. Clean Filter More Frequently. Thermostat Out Of Adjustment Or Defective. Test Thermostat. Replace If Necessary. Pressure Switch Inoperative. Test Pressure Switch. Replace If Necessary. LEAKING HEAT EXCHANGER. Overly Acid Water Or Freeze-Up. Replace Heat Exchanger And Maintain Water Chemistry Properly. LEAKING AT WELL. Overly Acid Water Or Freeze-Up. Replace Well. Maintain Water Chemistry. LEAKING AT UNION NUT CONNECTIONS. OVERHEATED O-RINGS (BRITTLE). Heater Continues To Run After Pump Shuts Off. Refactory Damage. See Pressure Switch Adjustment. Replace leaking O-Rings. Replace Refactory. 35