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Summary of Contents for Hayward ED2
- Page 1 AULT HUMBNAILS...
- Page 2 AULT HUMBNAILS – F LOWER ACUUM WITCH AILED LOSED – F LOWER ACUUM WITCH AILED LOSED If the blower vacuum switch is closed before blower start-up, the control module will not start the blower. Pre-check is executed by the control module. ARTS EEDED •...
- Page 3 AULT HUMBNAILS – F LOWER ACUUM WITCH AILED – F LOWER ACUUM WITCH AILED If the blower vacuum switch opens unexpectedly during operation, the heater will shut down and attempt to re-light if there is still a call for heat. If the blower vacuum switch does not close after the blower starts, the control will stop the ignition trial &...
- Page 4 AULT HUMBNAILS OARD ECONDARY OLTAGE AULT OARD ECONDARY OLTAGE AULT ARTS EEDED • Control Module / Ignition Board • Extra Fuses • Fuse Board • Wiring Harness • Transformer IAGNOSTIC EQUENCE Verify that FC4 fuse on fuse board is not open. Remove FC from fuse- holder.
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Page 5: Bypass Operation
YPASS PERATION XTERNAL ONTROLS UHS, IDL2, IDL, ED2 The “bo” code is more of an information code than a fault code, with the “bo” standing for Bypass Operation. A “bo” code indicates the heater’s internal thermistor is disabled, allowing the external thermostat control to operate. -
Page 6: Communication Error
AULT HUMBNAILS OMMUNICATION RROR OMMUNICATION RROR ARTS EEDED • Control Module/Ignition Board •. Display Board • Membrane Switch/Keypad. ERROR DETAIL OMMUNICATION RROR & BETWEEN CONTROL MODULE DISPLAY INTERFACE ASSEMBLY If communication between the ignition board and the display board is not established within 3 seconds of power-up, an error will be displayed. - Page 7 AULT HUMBNAILS LECTRICAL RROR LECTRICAL RROR ARTS EEDED • Control Module / Ignition Board IAGNOSTIC EQUENCE Replace the Control Module / Ignition Board. IDL2...
- Page 8 A. Check all wiring and connections for Flame sensor. • Gas Valve B. Replace flame sensor (IDL) or ignitor (ED2). If flame is sensed without the gas valve energized, the control will go C. Replace control module/ignition board if problem still exists.
- Page 9 XCEEDED AXIMUM ETURN ATER EMPERATURE XCEEDED UHS, IDL2, IDL, ED2 If water temperature exceeds 105°F, the heater will shut down and go into lock-out. Automatic restart is 2 minutes after water temp drops below 105°F. ARTS EEDED • Control Module •...
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Page 10: Ignition Failure
If OK, proceed to next step. UHS, IDL2, IDL, ED2 C. Inspect flame sense wiring, and ensure wire harness terminals are se- curely fastened to flame sense and to control module. If OK, proceed... - Page 11 AULT HUMBNAILS GNITOR AILURE GNITOR FAILURE ARTS EEDED • Ignitor • Control Module / Ignition Board IAGNOSTIC EQUENCE A. Check for faulty wiring or connection. B. Replace ignitor. C. Replace Control Module/Ignition Board NOTE: Red letters above correspond with adjacent illustrations. IDL2...
- Page 12 AULT HUMBNAILS WITCH PEN WITHIN AFETY IMIT TRING WITCH PEN WITHIN AFETY IMIT TRING F13) EE PAGE F14) EE PAGE IDL2 F15) EE PAGE F13) EE PAGE...
- Page 13 AULT HUMBNAILS (UHS, IDL2) WITCH PEN WITHIN AFETY IMIT TRING IAGNOSTIC EQUENCE CONTINUED Possibility 2: Vent Pressure Switch Fault WITCH PEN WITHIN AFETY IMIT TRING (For UHS indoor installations only) G. Check the vent pressure switch for faulty wiring and connections: En- UHS, IDL2 sure wire harness terminals are securely fastened to spade terminals on vent pressure switch.
- Page 14 AULT HUMBNAILS (IDL) WITCH PEN WITHIN AFETY IMIT TRING IAGNOSTIC EQUENCE CONTINUED Possibility 2: Terminal Block Fault G. Check if a remote on/off device connected to terminal block is open: Turn WITCH PEN WITHIN AFETY IMIT TRING remote device on, and watch for LO code to clear. If LO does not clear, go to step I.
- Page 15 AULT HUMBNAILS (ED2) WITCH PEN WITHIN AFETY IMIT TRING IAGNOSTIC EQUENCE CONTINUED Possibility 2: Automatic Temperature Limit Switch Fault WITCH PEN WITHIN AFETY IMIT TRING F. Check the (automatic) temperature limit switch for faulty wiring and connections: Ensure wire harness terminals are securely fastened to spade terminals on the temp limit switch.
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Page 16: Keypad Failure
AULT HUMBNAILS EYPAD AILURE EYPAD AILURE ARTS EEDED • Keypad/Membrane Switch IAGNOSTIC EQUENCE A. Replace keypad/membrane switch. IDL2... - Page 17 AULT HUMBNAILS EMPERATURE ENSOR NPUT AILURE EMPERATURE ENSOR NPUT AILURE ARTS EEDED • Thermistor • Control Module IAGNOSTIC EQUENCE A. Check where the thermistor connects to the board to see if it has become disconnected or damaged. B. Replace thermistor if wire or connection is damaged. C.
- Page 18 AULT HUMBNAILS NO CODE AULT ONDITIONS WITH NO CODE I. Verify 24VAC across R and C terminals on control module. AULT ONDITIONS WITH If not OK, replace harness. J. Remove F1 fuse from fuseholder. Measure continuity across fuse. UHS, IDL2 If OK, replace control module.
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