1801 Commercial Electric Water Heater Troubleshoot
User Manual: Commercial-electric-water-heater-troubleshoot
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http://waterheatertimer.org/3-phase-water-heater.html http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html TECHNICAL SERVICE DEPARTMENT Technical Service Bulletin 1-800-432-8373 Commercial Electric Troubleshooting Tables NATURE OF TROUBLE No Hot Water Not Enough Hot Water POSSIBLE CAUSES Manual switch turned off Blown service panel fuse or breaker High limit switch tripped Thermostat faulty Faulty contactors (open) One or both transformer fuses are blown Thermostat out of calibration Improper wiring a. Shorted or loose wiring b. Undersized service wire Thermostat set too low Faulty element(s) Faulty Contactors (open) Faulty fuse on fuse block Improper or loose wiring Improper heating elements Scale formation on heating elements Thermostat not flush with tank Poor grounding of tank Heater is undersized Damaged dip tube (ELDs only) Water too hot Blows fuses and / or trips breaker Slow hot water recovery Thermostat setting too high Thermostat out of calibration Thermostat not flush with tank Faulty contactors (closed) One or more elements are grounded Loose terminal screws on heating element(s) Faulty contactors Undersized heater Heating elements too small Faulty contactors Fuses on fuse block are blown SERVICE Turn to ON Replace or reset Manually reset ECO button Check and replace Check and replace Check and replace Check and replace Check and rewire Rewire per wiring diagram Increase thermostat Check for open or grounded elements and replace Check and replace Check and replace Rewire per wiring diagram Check and tighten Check wattage/voltage to rating plate and replace Check elements; clean or replace Position thermostat so back touches the tank. Make sure cavity insulation covers thermostat Check grounding and tighten Resize and compare Check and replace Lower thermostat setting Check and replace Position thermostat so back touches the tank Check contactors and replace Check and replace Check and tighten Check contactors and replace Resize and compare Check wattage and replace Check contactors and replace Check fuses and replace Technical Competence, Product Confidence Page 1 of 3 1801.doc TECHNICAL SERVICE DEPARTMENT Technical Service Bulletin 1-800-432-8373 Commercial Electric Troubleshooting Tables NATURE OF TROUBLE Noisy water heater Excessive relief valve operation POSSIBLE CAUSES SERVICE Scale build-up on elements High watt density elements in the heater Remove, clean or replace Install low watt density elements Contactors are ‘chattering’ Check for foreign material in the contactors. Check for broken or weak spring Install proper expansion tank on cold side Check for open or closed system. Install thermal expansion tank Excessive water pressure (just a little water from the T&P) Excessive temperature ( a whole bunch of water from the T&P) Rusty or black water Scale formation on elements Anode rod dissolved Excessive sediment build-up Water heater is leaking (Caution: Do not confuse normal T&P operation as a leaking tank. If the puddle dries up, then look for a T&P problem.) Cold in or hot out joints T&P valve Heating elements, anode rod and gaskets Inner tank has a pin hole Check thermostat; lower setting or replace. Thermostat not flush with tank Check contactors to see if two or more are closed. Clean or replace elements Check anode rod and replace Try to drain tank; replace tank if sediment build up is excessive Check joint and repair Check valve and replace Check, tighten and replace Replace water heater (When diagnosing a leaker - you will notice a puddle of water on the floor, next to the heater, that will not go away.) Technical Competence, Product Confidence Page 2 of 3 1801.doc TECHNICAL SERVICE DEPARTMENT Technical Service Bulletin 1-800-432-8373 Commercial Electric Troubleshooting Tables Multi-Stages, Series and Parallel Installation NATURE OF TROUBLE No Hot Water Not Enough Hot Water POSSIBLE CAUSES Manual switch turned off Blown service panel fuse or breaker tripped High limit switch tripped Thermostats faulty Faulty contactors (open) One or both transformer fuses are blown Thermostat out of calibration Improper wiring a. Shorted or loose wiring b. Undersized service wire Thermostats set too low Faulty element(s) Faulty Contactors (open) Faulty fuse on fuse block Improper or loose wiring Improper heating elements Water too hot Blows fuses and / or trips breaker Poor grounding of tank Heater is undersized Thermostat setting too high Thermostat out of calibration Faulty contactors (closed) One or more elements are grounded Loose terminal screws on heating element(s) Faulty contactors Undersized heater SERVICE Turn to ON Replace or reset Manually reset ECO button Check and replace Check and replace Check and replace Check and replace Check and rewire Rewire per wiring diagram Increase thermostat setting Check for open or grounded elements and replace Check and replace Check and replace Rewire per wiring diagram Check and tighten Check wattage/voltage to rating plate and replace Check grounding and tighten Resize and compare Lower thermostat setting Check and replace Check contactors and replace Check and replace Check and tighten Check contactors and replace Resize and compare Technical Competence, Product Confidence Page 3 of 3 1801.doc
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