Universal H Series Troubleshooting Guide
Page 3
Heater not powering up 21-26 2. "BD" Code 34-35 6. "SF" or "HS" Code 9. "AC" Code 56-57 14. Open FC1&/FC2 Fuse 27-28 3. "LO" Code 46-51 12. "AO" Code 58-60 Heat Exchanger: Flow requirements 61 Heat Exchanger: Inspection 62 Heat Exchanger: Potential Failure Causes 63 UHS Wiring Schematic 64 UHS Wiring Diagram 65...
Heater not powering up 21-26 2. "BD" Code 34-35 6. "SF" or "HS" Code 9. "AC" Code 56-57 14. Open FC1&/FC2 Fuse 27-28 3. "LO" Code 46-51 12. "AO" Code 58-60 Heat Exchanger: Flow requirements 61 Heat Exchanger: Inspection 62 Heat Exchanger: Potential Failure Causes 63 UHS Wiring Schematic 64 UHS Wiring Diagram 65...
Universal H Series Troubleshooting Guide
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... reversed, low voltage detected Keypad failure Temperature Sensor (thermistor) input failure 19 Diagnostic Codes Below is a list of all Diagnostic Codes for each Code are covered on the following pages. Diagnostic Code AC AO BD CE EE HF HS IF IO LO PF SB SF Description Blower Vacuum Switch closed Blower Vacuum Switch open Bad...
... reversed, low voltage detected Keypad failure Temperature Sensor (thermistor) input failure 19 Diagnostic Codes Below is a list of all Diagnostic Codes for each Code are covered on the following pages. Diagnostic Code AC AO BD CE EE HF HS IF IO LO PF SB SF Description Blower Vacuum Switch closed Blower Vacuum Switch open Bad...
Universal H Series Troubleshooting Guide
Page 46
.../clean filter Replace wire harness: FDXLWHA1930 Replace water pressure switch: FDXLWPS1930 Go to section B (next page) YES Is this heater installed indoors? Service LED ON: "LO" Code "LO" Code Verify adequate water flow, is continuity present? NO Replace high limits kit: FDXLHLI1930 Problem solved
.../clean filter Replace wire harness: FDXLWHA1930 Replace water pressure switch: FDXLWPS1930 Go to section B (next page) YES Is this heater installed indoors? Service LED ON: "LO" Code "LO" Code Verify adequate water flow, is continuity present? NO Replace high limits kit: FDXLHLI1930 Problem solved
Universal H Series Troubleshooting Guide
Page 47
... switch continuity Is tube YES damaged? NO YES Vent sized correctly? NO Clean flue and retest Refer to installation/ indoor vent instructions Service LED ON: "LO" Code Section B (continued from previous page) YES Heater made after Feb. 2016? NO Replace vent pressure switch: FDXLVPS1930 Replace exhaust gas limit switch: FDXLEGL1931 YES Is...
... switch continuity Is tube YES damaged? NO YES Vent sized correctly? NO Clean flue and retest Refer to installation/ indoor vent instructions Service LED ON: "LO" Code Section B (continued from previous page) YES Heater made after Feb. 2016? NO Replace vent pressure switch: FDXLVPS1930 Replace exhaust gas limit switch: FDXLEGL1931 YES Is...
Universal H Series Troubleshooting Guide
Page 48
Service LED ON: "LO" Code "LO" Code (Limit Open) may relate to Step 11C. 48 Verify the pump is running ). Inspect water pressure switch Step 11A Continuity test Step 11B Inspect the water pressure switch wiring, ensuring wire harness terminals are securely fastened. IF OK, go to step 11B. "LO" is NORMAL when the pump is...
Service LED ON: "LO" Code "LO" Code (Limit Open) may relate to Step 11C. 48 Verify the pump is running ). Inspect water pressure switch Step 11A Continuity test Step 11B Inspect the water pressure switch wiring, ensuring wire harness terminals are securely fastened. IF OK, go to step 11B. "LO" is NORMAL when the pump is...
Universal H Series Troubleshooting Guide
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Service LED ON: "LO" Code (cont.) Pressure switch adjustment Step 11C Inspect and test high limits Step 11D Some sites may require a pressure switch adjustment. Vent pressure switch/tubing Step ...
Service LED ON: "LO" Code (cont.) Pressure switch adjustment Step 11C Inspect and test high limits Step 11D Some sites may require a pressure switch adjustment. Vent pressure switch/tubing Step ...
Universal H Series Troubleshooting Guide
Page 50
11. See indoor vent sizing requirements in damage to step 11H. IF NOT, contact installer. Service LED ON: "LO" Code (cont.) Note: Please ensure that flue is sufficient for the heater model installed. Failure to properly size venting may result in the heater's Installation Manual/...
11. See indoor vent sizing requirements in damage to step 11H. IF NOT, contact installer. Service LED ON: "LO" Code (cont.) Note: Please ensure that flue is sufficient for the heater model installed. Failure to properly size venting may result in the heater's Installation Manual/...
Universal H Series Troubleshooting Guide
Page 51
Once the switch has tripped then it NEEDS to be replaced and the heat exchanger should be inspected for soot or damage. IF open, replace switch (pg. 20). Indoor/Outdoor: Feb. 2016 and newer Step 11I Test continuity across the exhaust gas limit switch. 11. IF switch does not exist AND problem still persists, contact support: (908) 355-7995 51 Service LED ON: "LO" Code (cont.) Note: This switch is a one time safety.
Once the switch has tripped then it NEEDS to be replaced and the heat exchanger should be inspected for soot or damage. IF open, replace switch (pg. 20). Indoor/Outdoor: Feb. 2016 and newer Step 11I Test continuity across the exhaust gas limit switch. 11. IF switch does not exist AND problem still persists, contact support: (908) 355-7995 51 Service LED ON: "LO" Code (cont.) Note: This switch is a one time safety.
uhs_qrg_20f0
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...LO - Flame present with gas valve not energized HS - Voltage polarity reversed, low voltage detected Sb - Temperature Lockout SERVICE HEAT STANDBY SPA POOL Max Pool Temp Limit is Pre-set To Energy-saving 90 F, See Owner's Manual. Pool; SERVICE STANDBY HEAT SPA Press MODE again to return to : www.hayward... Pre-set To Energy-saving 90 F, See Owner's Manual. To take a closer look or see other Hayward products please go to STANDBY. Programming Diagnostic Codes: AC - Communication error between control module and display interface assembly EE - Ignition failure IO - Hold &...
...LO - Flame present with gas valve not energized HS - Voltage polarity reversed, low voltage detected Sb - Temperature Lockout SERVICE HEAT STANDBY SPA POOL Max Pool Temp Limit is Pre-set To Energy-saving 90 F, See Owner's Manual. Pool; SERVICE STANDBY HEAT SPA Press MODE again to return to : www.hayward... Pre-set To Energy-saving 90 F, See Owner's Manual. To take a closer look or see other Hayward products please go to STANDBY. Programming Diagnostic Codes: AC - Communication error between control module and display interface assembly EE - Ignition failure IO - Hold &...