34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax 734.419.0209 • www.hamiltonengineering.com • LIT91127 REV 3/09
29.
First check that the pump is circulating like it should, that there are no obstacles between the
appliance and the tank (or in any of the inlet/outlet piping), and that the appliance is still making
noise. Then the heat exchanger will need to be acid cleaned.
DO NOT RUN THE APPLIANCE UNTIL THIS IS DONE!
30.
Replace the high-limit thermostat by unscrewing it from the brass nut; no draining is needed (do
not remove the brass nut)
31. Go over the Fan RPM settings as outlined in Table 3-4 on page 12-13
35.
Replace. Or when bending, take care: bend near the burner plate, or there may be
risk of cracking
39. Remove the connection and blow dry using a hair dryer or compressed air
40.
The plug wire connection must point to the outside of the fan. One side should t into the groove
on the PCB
41. Check the plugs and t into one another correctly
42. Check cables for possible damage or entrapment, and replace as required
44.
Check the seal of the heat exchanger on the ue gas casing, and replace as required. Fit a new
rotary lip seal. Lift the ue gas tube and inspect the Non-Return Valve from the top
45. Check the ow and DHW lines
46.
Disconnect leads from sensor and place an OHM meter across both terminals on
the sensor. Compare to Figure 7-1 on page 32. If it does not match, replace
51. Contact Hamilton Engineering for assistance at 800.968.5530
52.
Check the type of room thermostat and contact Hamilton Engineering for assistance at
800.968.5530
53. Contact Hamilton Engineering for assistance at 800.968.5530
54. Change the “wake-up” times of the clock thermostat
57. Check the sensor on the storage tank or in the common piping
60.
It may occur that the 18-pin FMT 914 plug moved up one pin too far—this may cause a fault in
the communication between the wiring and the pins. Check both the left and the right-hand side
of the plugs to ensure they are placed correctly
61.
A defective gas valve usually has one of the two causes: the electric coils are
defective, or an internal defect to the gas valve. In either case, it is recommended
to replace the entire gas valve
63. Contact Hamilton Engineering for assistance at 800.968.5530
66. Re-adjust the gas valve per the instructions on pages 11-13
67. Check the venting system completely for blockage
68.
If the setting is correct and all possible causes of blocked ue or condensate drain system have
been eliminated, replace the pressure switch
69.
When there is water in the tube, there must be a leakage by one of the connections (air can
escape through this leak), and inspect the tube for small cracks. Replace the plastic tube as
needed.
SERVICING
(TABLE 7-6) TROUBLESHOOTING THE FAULT (CONTINUED)
Page 30 of 50
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