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Smith Technical Information Water Products Co. 78 Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont. Trouble- shooting cont BLOWER RUNS CONSTANTLY (CALLING FOR HEAT, NO PILOT) First make the Preliminary Checks (see page 71) then perform each of the following tests until cause of the failure is determined: 1. Air Pressure Switch Test 2. Vent High Limit Test 3. Blower Test 4. Cable Test 5. High Limit Test 6. TH Wire Test 7. PV - MV/PV Test 8. Spark Test 9. Pilot Solenoid Test ©1995 A.O. Smilh Technical Information Water Products Cd. 79 Iruinn Tpras CO I- UJ Û- PPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont. Trouble- BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont. shooting cont. RESULTS If: then: the meter does not read 24 VAC, replace the air pressure switch. the meter does read 24 VAC, go to Step 2. Load=Wire carrying current onto high limit FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK Troubleshooting cont. VENT HIGH LIMIT TEST s SET UP THE TEST - Reconnect the air pressure switch, T 2 - disconnect the load wire from the vent high limit, then E - using a multimeter, test for 24 VAC between wire and ground as shown. - Vent high limit may have shut the heater down due to excessive temperature. P See pages 10, 11, 12, 17, 18) Load=Wire carrying current onto connector FPS 75 SERVICE AND OPERATION cont BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont ©1995 A.O. Smith Technical Information Water Products Co. 81 Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont. Trouble- BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont shooting cont. BLOWER TEST s SET UP THE TEST - Reconnect the wire to vent high limit, T 3 - disconnect the 4 wire cable from the blower control box, E - using an insulated jumper wire, jump between pins 1 and 3 (caution 120 VAC) on plug receptacle, then P - using a multimeter, test for 24 VAC between pins 2 and 4 as shown. RESULTS If: then: the meter does not read 24 VAC, replace the blower. the meter does read 24 VAC, go to Step 4. ©1995 ; A.O. Smith Technical Information Water Products Co. 82 Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont. Trouble- BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont shooting cont. CABLE TEST s SET UP THE TEST - Reconnect the 4 wire cable to the blower control box, T 4 - disconnect the cable from receptacle on door below, E - using an insulated jumper wire, jump between pins 1 and 3 (caution 120 VAC) on cable plug , then P - using a multimeter, test for 24 VAC between pins 2 and 4 as shown. RESULTS If: then: the meter does not read 24 VAC, replace the cable. the meter does read 24 VAC, go to Step 5. Technical Information Irving, Texas ©1995 A.O. Smith Water Products Co. FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont Trouble- BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont shooting cont. HIGH LIMIT TEST SET UP THE TEST - Reconnect the cable to receptacle on the door, - remove covers from door and thermostat, - inspect wire between connector and high limit for lack of continuity or loose connections, correct either of these conditions if necessary, - remove one of the wires from the high limit, then - using a multimeter, test for 24 VAC at screw on high limit and ground as shown. RESULTS If: then: the meter does not read 24 VAC, replace high limit. the meter does read 24 VAC, go to Step 6. ©1995 A.O. Smith Water Products Co. FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont Trouble- BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont shooting cont. TH WIRE TEST s SET UP THE TEST - Reconnect the wire to high limit, T 6 - inspect wire between high limit and I. I D. for lack of continuity or loose E connections, correct either of these conditions if necessary, then P - using a multimeter, test for 24 VAC at TH wire on the 1.I D. and ground as shown. RESULTS If: then: the meter does not read 120 VAC, replace wire. the meter does read 120 VAC, go to Step 7. ©1935 A,D. Smith Technicalinformatiort WAtaf Products Co 85 Irvino. Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont. Trouble- BLOWER RUNS CONSTANTLY (Calling for heat, no pilot) cont shooting cont. PV - PV/MV TEST s SET UP THE TEST - Using a multimeter, test for 24 VAC between PV (pilot valve) and PV/MV on I.I.D. T 7 as shown. E - Sparking should stop when pilot is lit. (If sparking does not stop see page 92) P RESULTS If: then: the meter does not read 24 VAC, replace the I.I.D. the meter does read 24 VAC, go to Step 8. Water Products Co. 86 Technical Information Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING...

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