Lochinvar 1, 1.3, 1.5 Checking temperature sensors

3 Troubleshooting

Table 3B - Inlet/Outlet and Tank Sensor Resistance vs. Temperature

Temperature Resistance Temperature Resistance

50 18,780 158 1,990

68 12,263 176 1,458

86 8,194 194 1,084

104 5,592 212 817

122 3,893 -- --

140 2,760 -- --

Table 3C - Flue Temperature Sensor Resistance vs. Temperature

Temperature Resistance Temperature Resistance

68 14,773 176 1,707

86 9,804 194 1,266

104 6,652 212 952

122 4,607 230 726

140 3,252 248 560

158 2,337 -- --

Checking temperature sensors

The water heater temperature sensors (inlet water, outlet water, system water, and flue) are all resistance type devices. The

following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the

sensor at a known temperature. If the resistance of the sensor does not closely match its corresponding table, replace the sensor.

Service Manual

Contents

Main Service Manual Models: 1.0, 1.3, and 1.5 Hazard definitions DANGER WARNING CAUTION CAUTION NOTICE Contents Please read before proceeding Please read before proceeding Handling ceramic fiber materials NIOSH stated First Aid. When servicing water heater Water heater operation What is in this manual? Service The Armor X2 water heater display Control module inputs Control module outputs Page Control inputs SECONDARY SMART CONTROL MODULE PRIMARY SMART CONTROL MODULE Page General Operation How the water heater operates Sequence of operation Access modes Sequence of operation Parameter table Table 1B This table lists the parameters and where to access them SERVICE / SETUP NIGHT Table 1B (continued from previous page) This table lists the parameters and where to access them CASCADE SETBACK BMS Viewable and changeable control parameters Status Screen: Page Details Screen: Page Main Screen: Setup Screen: Service/Setup Parameters Screen: Page Set Point Parameters Screen: Night Setback Parameters Screen: Cascade Parameters Screen: 0 - 10Vdc BMS Parameters Screen: Page Cascade Screen: Page Temps Screen: Burners Screen: Graph Select Screen: History Screen: Service Mode Screen: Maintenance and annual startup Service technician Monthly Daily 2 Flue vent system and air piping Check water system Check expansion tank Check water heater relief valve Inspect ignition and flame sense electrodes 2 Check flame signal Review with owner Cleaning water heater heat exchanger Check Delta T Water Heater Pump Applications Oiled bearing circulators Alarm Screen: Before troubleshooting: Check the following: Check control module fuses FAULT CAUSE CORRECTIVE ACTION Checking temperature sensors Table 3D Troubleshooting Chart - Noisy System FAULT CAUSE CORRECTIVE ACTION Noisy Operation No Pump Operation - HW Pump Relief Valve Opening Table 3E Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface Flow Switch/ LWCO Condensate Drain Blocked Flame out of Sequence Gas Valve / Connection Burner Did Not Light (contd) Flame Lost While Running Flame Lost While Running (contd) Manual Reset High Limit Automatic Reset High Limit / HEX- Temp SW Blower RPMs Too Low Blower RPMs Too High Sensor Open Sensor Shorted Flue Sensor Open / Removed Flue Sensor Shorted Air Flow Too Low Flap Valve Stuck Open Too Many Resets - Try Later Voltage Too Low Internal Fault Writing to Memos CRC Parameters No Error Stored Flue Temp Shutdown Combustion Analysis Procedure Gas valve adjustment procedure Model 1.0 Models 1.3 - 1.5