Universal H Series Troubleshooting Guide
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Integrated Control Board Layout (ICB) C B A J 4 D I E A Remote Control: 24VAC (E1) F B Flame Sensor (E4) C Temperature Sensor (E2) G D Display Output: 24VAC (E7) E 3A Fuse (F1) F Low Voltage R & C: 24VAC (E12, E13) G Gas Valve & Safety Switches: 24VAC (E11) H H High Voltage: 120VAC (E10) I Blower/Inducer (E6) J Ignitor (E3)
Integrated Control Board Layout (ICB) C B A J 4 D I E A Remote Control: 24VAC (E1) F B Flame Sensor (E4) C Temperature Sensor (E2) G D Display Output: 24VAC (E7) E 3A Fuse (F1) F Low Voltage R & C: 24VAC (E12, E13) G Gas Valve & Safety Switches: 24VAC (E11) H H High Voltage: 120VAC (E10) I Blower/Inducer (E6) J Ignitor (E3)
Universal H Series Troubleshooting Guide
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...flame sensor are constantly monitored during step four, the heater fails to fire, please procced to the next page for open blower vacuum switch 2. The gas valve is de-energized, and the flame is 1º below the set temp to light operations. 7 At proper ignitor temp, a 4 second trial...3. The blower will operate for one second. UHS Sequence of 4 sec trial. NOTE: If during call for a closed blower vacuum switch. 4. Gas valve opens and monitors flame sense. The control checks for more details outlining failure to the actual water temp. When the water temp is extinguished. 6. ...
...flame sensor are constantly monitored during step four, the heater fails to fire, please procced to the next page for open blower vacuum switch 2. The gas valve is de-energized, and the flame is 1º below the set temp to light operations. 7 At proper ignitor temp, a 4 second trial...3. The blower will operate for one second. UHS Sequence of 4 sec trial. NOTE: If during call for a closed blower vacuum switch. 4. Gas valve opens and monitors flame sense. The control checks for more details outlining failure to the actual water temp. When the water temp is extinguished. 6. ...
Universal H Series Troubleshooting Guide
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Starts over at #2 of Operation: Failure to retry every 60 minutes, until lockout (IF code). 4. Waits 60 minutes then retries 3 more times. 5. Retries 3 times until demand for heat is stopped. UHS Sequence of heating mode sequence. 3. Gas valve de-energizes (for certain situations. 8 NOTE: When making keypad entries of any type there may be a 5-10 sec delay for 30 second, blower post purge). 2. Will continue to Light If trial fails: 1.
Starts over at #2 of Operation: Failure to retry every 60 minutes, until lockout (IF code). 4. Waits 60 minutes then retries 3 more times. 5. Retries 3 times until demand for heat is stopped. UHS Sequence of heating mode sequence. 3. Gas valve de-energizes (for certain situations. 8 NOTE: When making keypad entries of any type there may be a 5-10 sec delay for 30 second, blower post purge). 2. Will continue to Light If trial fails: 1.
Universal H Series Troubleshooting Guide
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Step 2 The static & load values should be within the levels listed on the data plate, example on / energized), as shown below. Step 1 Measure the outlet manifold pressure (valve on Page 17. NOTE: Please refer to Installation Manual for propane. Manifold reading should be between 1.8"- 2.0" w.c for natural Gas or 6.8"- 7.0" w.c for proper gas line sizing. 16 How To: Test/Adjust Gas Pressure Measure the inlet static pressure (valve off) & load pressure (valve on / energized).
Step 2 The static & load values should be within the levels listed on the data plate, example on / energized), as shown below. Step 1 Measure the outlet manifold pressure (valve on Page 17. NOTE: Please refer to Installation Manual for propane. Manifold reading should be between 1.8"- 2.0" w.c for natural Gas or 6.8"- 7.0" w.c for proper gas line sizing. 16 How To: Test/Adjust Gas Pressure Measure the inlet static pressure (valve off) & load pressure (valve on / energized).
Universal H Series Troubleshooting Guide
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...4. Verify heater specifications off the heater plate (bottom front inside heater) Step 3 Step 4 *Adjust the manifold pressure (at the gas valve) IF inlet pressures are correct AND the manifold pressure is within range, then your manifold pressure should be correct per factory settings. Once...to reduce pressure). *NOTE: Before any adjustment occurs, verify inlet gas pressure meets the requirement set forth by rotating valve clockwise, (counter clockwise to step 4. How To: Test/Adjust Gas Pressure (cont.) NOTE: IF incoming gas pressure is high or low, go to installation manual and/or...
...4. Verify heater specifications off the heater plate (bottom front inside heater) Step 3 Step 4 *Adjust the manifold pressure (at the gas valve) IF inlet pressures are correct AND the manifold pressure is within range, then your manifold pressure should be correct per factory settings. Once...to reduce pressure). *NOTE: Before any adjustment occurs, verify inlet gas pressure meets the requirement set forth by rotating valve clockwise, (counter clockwise to step 4. How To: Test/Adjust Gas Pressure (cont.) NOTE: IF incoming gas pressure is high or low, go to installation manual and/or...
Universal H Series Troubleshooting Guide
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... Blower Vacuum Switch open Bad board or secondary high voltage fault Communication Error Between Control Module and Display Interface Assembly Bad board Flame present with Gas Valve not energized. Troubleshooting Steps for the UHS Heater.
... Blower Vacuum Switch open Bad board or secondary high voltage fault Communication Error Between Control Module and Display Interface Assembly Bad board Flame present with Gas Valve not energized. Troubleshooting Steps for the UHS Heater.
Universal H Series Troubleshooting Guide
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...Fuse Kit FDXLWPS1930 FDXLWPS1930 Water Pressure Switch FDXLBVS1930 FDXLBVS1930 Blower Vacuum Switch FDXLBRN1930 FDXLBRN1930 Burner Kit *FDXLGSV0001 FDXLGSV1500N Gas Valve (Natural Gas) FDXLGSV002 FDXLGSV1500P Gas Valve (Propane) FDXLVPS1930 FDXLVPS1930 Vent Pressure Switch Part Number: Part Number: (H150-H400) (H500) IDXL2TRF1930 IDXL2TRF1930... Combustion Blower Tube Kit IDXL2DB1930 IDXL2DB1930 Prior 07/16-Display Board (only) FDXLEGL1931 FDXLEGL1931 Exhaust Gas Limit Switch FDXLBKP1930 FDXLBKP1930 Prior 07/16-Bezel/Keypad Assy. FDXLHLI1930 FDXLHLI1930 High Limit Kit (temperature limits)...
...Fuse Kit FDXLWPS1930 FDXLWPS1930 Water Pressure Switch FDXLBVS1930 FDXLBVS1930 Blower Vacuum Switch FDXLBRN1930 FDXLBRN1930 Burner Kit *FDXLGSV0001 FDXLGSV1500N Gas Valve (Natural Gas) FDXLGSV002 FDXLGSV1500P Gas Valve (Propane) FDXLVPS1930 FDXLVPS1930 Vent Pressure Switch Part Number: Part Number: (H150-H400) (H500) IDXL2TRF1930 IDXL2TRF1930... Combustion Blower Tube Kit IDXL2DB1930 IDXL2DB1930 Prior 07/16-Display Board (only) FDXLEGL1931 FDXLEGL1931 Exhaust Gas Limit Switch FDXLBKP1930 FDXLBKP1930 Prior 07/16-Bezel/Keypad Assy. FDXLHLI1930 FDXLHLI1930 High Limit Kit (temperature limits)...
Universal H Series Troubleshooting Guide
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...FDXLWHA1930 OR pressure switch if damaged: FDXLWPS1930 Replace wire harness: FDXLWHA1930 OR vacuum switch if damaged: FDXLBVS1930 Replace wire harness: FDXLWHA1930 OR Replace gas valve: Please refer to (pg. 20) NO Is blower vacuum switch wiring damaged, pinched, or worn? NO Replace ICB: FDXLICB1930 29 Is... low voltage wiring damaged, pinched, or worn? NO Is gas valve wiring damaged, pinched, or worn? NO Is water pressure switch wiring damaged, pinched, or worn? NO YES Inspect ICB wiring, any wires...
...FDXLWHA1930 OR pressure switch if damaged: FDXLWPS1930 Replace wire harness: FDXLWHA1930 OR vacuum switch if damaged: FDXLBVS1930 Replace wire harness: FDXLWHA1930 OR Replace gas valve: Please refer to (pg. 20) NO Is blower vacuum switch wiring damaged, pinched, or worn? NO Replace ICB: FDXLICB1930 29 Is... low voltage wiring damaged, pinched, or worn? NO Is gas valve wiring damaged, pinched, or worn? NO Is water pressure switch wiring damaged, pinched, or worn? NO YES Inspect ICB wiring, any wires...
Universal H Series Troubleshooting Guide
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.... 20). IF OK, go to step 3E. Inspect blower vacuum switch Step 3C With power off , inspect the blower vacuum switch wiring for damage. Inspect gas valve wiring Step 3D With power off , inspect the water pressure switch wiring for damage. IF OK, go to step 3B. IF damaged, replace the wire... harness (pg. 20). IF OK, go to step 3C. IF OK, go to step 3D. 30 With power off, inspect the gas valve wiring for damage. Open FC3 &/or F1 Fuse Inspect connections/high limits Step 3A Inspect water pressure switch Step 3B Power down and inspect all...
.... 20). IF OK, go to step 3E. Inspect blower vacuum switch Step 3C With power off , inspect the blower vacuum switch wiring for damage. Inspect gas valve wiring Step 3D With power off , inspect the water pressure switch wiring for damage. IF OK, go to step 3B. IF damaged, replace the wire... harness (pg. 20). IF OK, go to step 3C. IF OK, go to step 3D. 30 With power off, inspect the gas valve wiring for damage. Open FC3 &/or F1 Fuse Inspect connections/high limits Step 3A Inspect water pressure switch Step 3B Power down and inspect all...
Universal H Series Troubleshooting Guide
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Open FC3 &/or F1 Fuse (cont.) When testing the gas valve, if continuity appears between any terminal shows continuity, replace the gas valve (pg. 20). Inspect ICB wiring. Verify gas valve is damaged, replace the wire harness with a new wire harness kit (pg. 20). IF OK, go to pg. 20 for part number). IF ...3F With power off, measure resistance, comparing each terminal to ground. 3. IF any wires and ground, then this implies a short has occurred and the gas valve will need to be replaced (refer to step 3F. IF OK and the problem still exists, replace the ICB (pg. 20) 31
Open FC3 &/or F1 Fuse (cont.) When testing the gas valve, if continuity appears between any terminal shows continuity, replace the gas valve (pg. 20). Inspect ICB wiring. Verify gas valve is damaged, replace the wire harness with a new wire harness kit (pg. 20). IF OK, go to pg. 20 for part number). IF ...3F With power off, measure resistance, comparing each terminal to ground. 3. IF any wires and ground, then this implies a short has occurred and the gas valve will need to be replaced (refer to step 3F. IF OK and the problem still exists, replace the ICB (pg. 20) 31
Universal H Series Troubleshooting Guide
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NO Toggle the mode button and call for 24VAC off the gas valve Replace ICB: FDXLICB1930 Do you have YES manifold gas pressure? NO Verify error code & jump to section that best describes error Replace gas valve: Please refer to (pg. 20) 44 Reduce the temperature set point until heater stop firing Problem solved Did the "HF" YES code reappear? NO Service LED ON: "HF" Code "HF" Code Power cycle the heater at the breaker Does heater YES fire? NO Did the "HF" YES code reappear? NO Test for heat YES Is 24VAC present? 10.
NO Toggle the mode button and call for 24VAC off the gas valve Replace ICB: FDXLICB1930 Do you have YES manifold gas pressure? NO Verify error code & jump to section that best describes error Replace gas valve: Please refer to (pg. 20) 44 Reduce the temperature set point until heater stop firing Problem solved Did the "HF" YES code reappear? NO Service LED ON: "HF" Code "HF" Code Power cycle the heater at the breaker Does heater YES fire? NO Did the "HF" YES code reappear? NO Test for heat YES Is 24VAC present? 10.
Universal H Series Troubleshooting Guide
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...45 IF "HF" reappears, go into lockout. 10. The blower will continuously run blower for heat. IF 24VAC is still present at gas valve AND manifold pressure is not present, gas valve is off, the control will run until corrected. Press the mode button to suspend heating. Service LED ON: "HF" Code (cont....) "HF" (heat or flame sensed) will occur if flame is sensed when the gas valve is defective and needs to be replaced. When corrected, control will go to clear an erroneous "HF" code. IF power cycling clears to the "...
...45 IF "HF" reappears, go into lockout. 10. The blower will continuously run blower for heat. IF 24VAC is still present at gas valve AND manifold pressure is not present, gas valve is off, the control will run until corrected. Press the mode button to suspend heating. Service LED ON: "HF" Code (cont....) "HF" (heat or flame sensed) will occur if flame is sensed when the gas valve is defective and needs to be replaced. When corrected, control will go to clear an erroneous "HF" code. IF power cycling clears to the "...
Universal H Series Troubleshooting Guide
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... to section B (next page) On ICB, verify flame Inspect gas YES Is heater's gas YES sensor & gas valve valve in heater valve ON? NO Secure connections & retest (manometer attached) Is inlet YES pressure correct? NO YES Is voltage correct? NO Turn on main gas supply & retest Go to gas valve during call for heat pressure correct? NO NO Correct...
... to section B (next page) On ICB, verify flame Inspect gas YES Is heater's gas YES sensor & gas valve valve in heater valve ON? NO Secure connections & retest (manometer attached) Is inlet YES pressure correct? NO YES Is voltage correct? NO Turn on main gas supply & retest Go to gas valve during call for heat pressure correct? NO NO Correct...
Universal H Series Troubleshooting Guide
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NO Contact tech support: (908) 355-7995 53 12. NO Inspect and/or clean burner tubes & orifices Replace with new burner kit: FDXLBRN1930 OR Gas Valve (includes orifices): (pg. 20) YES Are burner tubes & orifices damaged? Service LED ON: "IF" Code Section B (continued from previous page) Is correct flame YES sensor installed OR damaged? NO Replace flame sensor: IDXLFLS1930 Check for damaged OR wrong blower air inlet plate NO Is plate YES damaged/ wrong?
NO Contact tech support: (908) 355-7995 53 12. NO Inspect and/or clean burner tubes & orifices Replace with new burner kit: FDXLBRN1930 OR Gas Valve (includes orifices): (pg. 20) YES Are burner tubes & orifices damaged? Service LED ON: "IF" Code Section B (continued from previous page) Is correct flame YES sensor installed OR damaged? NO Replace flame sensor: IDXLFLS1930 Check for damaged OR wrong blower air inlet plate NO Is plate YES damaged/ wrong?
Universal H Series Troubleshooting Guide
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..., go to step 12B. Flame sensor & gas valve Step 12C Verify that the gas valve, inside the heater, is in the "ON" position. IF correct, go to step 12C. IF correct, proceed to ON position. IF NOT, rotate knob to step 12D. 54 Ensure gas static, load, and manifold pressures are both ...ON: "IF" Code Inspect main gas supply Step 12A Verify gas valve is ON Step 12B IF "Ignition Failure", Ensure main gas supply is in the ON position. IF NOT, open gas supply. IF NOT, go to Step 12F. Verify gas pressure Step 12D Ensure both flame sensor and gas valve are correct (See Page 16 ...
..., go to step 12B. Flame sensor & gas valve Step 12C Verify that the gas valve, inside the heater, is in the "ON" position. IF correct, go to step 12C. IF correct, proceed to ON position. IF NOT, rotate knob to step 12D. 54 Ensure gas static, load, and manifold pressures are both ...ON: "IF" Code Inspect main gas supply Step 12A Verify gas valve is ON Step 12B IF "Ignition Failure", Ensure main gas supply is in the ON position. IF NOT, open gas supply. IF NOT, go to Step 12F. Verify gas pressure Step 12D Ensure both flame sensor and gas valve are correct (See Page 16 ...
Universal H Series Troubleshooting Guide
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... Step 12H Check for blockage. IF OK, go to step 12H. 55 Inspect Gas Orifices & Burners for damaged/wrong blower air inlet plate. IF present & no pressure (manometer attached), replace valve. Service LED ON: "IF" Code (cont.) Voltage/pressure off gas valve Step 12E Verify correct flame sensor Step 12F Verify 22-28VAC off...
... Step 12H Check for blockage. IF OK, go to step 12H. 55 Inspect Gas Orifices & Burners for damaged/wrong blower air inlet plate. IF present & no pressure (manometer attached), replace valve. Service LED ON: "IF" Code (cont.) Voltage/pressure off gas valve Step 12E Verify correct flame sensor Step 12F Verify 22-28VAC off...