Hayward HDF400 Troubleshooting Guide

ICB and Fuse Board Layout
4-
5
Troubleshooting: (cont.)
Pg.
27
-57
Sequence of Operation: Normal/Failure to Light
6
5. “BD” Code
38
Gas and Electrical Connections
7
6. "EE" or "CE" Code
39
How To:
Pg.
8-
26
7. "IO" or "SB" Code
40
Program Heater Bypass & Temperature Lockout
9-
11
8. "SF" or "HS" Code
41
Change/Replace Gas Mixer
12
9. "PF" Code
42
Test/Adjust Gas Pressure
13
-15
10. “HF” Code
43
Burner Inspection
16
-19
11. "LO: Code
44
-47
Change/Replace Combustion Chamber
20
-26
12. "IF" Code
48
-49
Troubleshooting:
Pg.
27
-57
13. "AC" Code
50
Diagnostic Codes and Part Numbers
28
-29
14. "A1, A2, A3" Codes
51
-53
Wiring Diagram
30
15. "b1" Code
54
1. Heater not powering up
31
-33
16. "b2" Code
55
2. Open FC1&/FC2 Fuse
34
17. "b3" Code
56
3. Open FC3&/F1 Fuse
35
-36
18. "b4" Code
57
4. Open FC4 Fuse
37
3
Table of Contents

Hayward HDF400 Specifications

General

Model	HDF400
Category	Gas Heater
BTU Input	400, 000 BTU
Fuel Type	Natural Gas or Propane
Heat Exchanger	Cupro-Nickel
Efficiency	84%
Ignition System	Electronic
Warranty	1 year