34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax 734.419.0209 • www.hamiltonengineering.com • LIT91127 REV 3/09
The numbers given in Tables 7-3 and 7-4 match with those in the following table to give the reason for the fault.
(TABLE 7-5) FAULT CAUSES
1. Room thermostat
4. Pump not running or partially clogged
5. Water pressure in the system too low (heat exchanger/radiator air bound)
7. Fan speed control wiring not connected (unplugged)
8. Fan blades are fouled - check for lint or dirt build-up on blades
9. Fan is defective
10. Manual gas valve under heater not open
11. Gas pressure is too low
12. Gas pipe diameter is too small
13. Fuse blown - replace with 3.15 amp only
16. Gas valve setting for low re is incorrect (the offset setting)
18. Ignition cable incorrectly connected
21. Power supply to the pump connected incorrectly
22. Condensate trap is plugged or drain line is blocked
23. Air bubble in heat exchanger - open air vent cap
25. Too much resistance in the ue system, or ue system has been restricted
26. Flue system incorrectly installed, allowing re-circulation of ue gas
28. Water piping shut off valve partially closed
29. Heat exchanger blocked (insufcient circulation)
30. High-limit thermostat defective (contacts corroded)
31. Maximum load is too high
35. Ignition electrode porcelain is cracked or spark gaps are incorrect
39. Moisture in the fan and/or the fan connection
40. Fan wiring plus for speed control (PWM) signal connected incorrectly
41. Fan wiring plug for 230 VAC power supply connected incorrectly
42. Damaged connecting cable to high limit sensor
44. The built-in non-return valve in the ue is partially blocked
45. Leak in hot water piping
46. Sensor defective; compare ohm reading to actual temp (see Figure 7-1 on page 32)
51. Parameter(s) in the installer program entered incorrectly
52. Room thermostat (or common thermostat) connected to an incorrect connector strip port
53. Pulse with program in the installer menu incorrectly programmed, or steps are too long
54. Clock program of the dock thermostat should start earlier in the morning
55. Flow and return line on the boiler have been changed around
57. Priority sensor (S3) not placed correctly, or is defective
60. Cable harness connectors incorrectly mounted on the PCB
61. Gas valve is defective
63. Incorrect parameters or values outside the range of the program have been entered
SERVICING
E. FAULT CAUSES
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