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6.2 Maintenance Frequency Chart
7. Troubleshooting
7.1 Fault Determination
The FireBird HD308 is equipped with a group of LED
“indicator lights”. The purpose of these lights is to aid in
determining where the fault lies if the heating unit should
fail to function properly. The following sequence explains
the function each light represents and what to look for if
that function fails:
If all switches have been turned ON and the system has
been operating but has now FAILED, the status of these 6
lights will help to isolate the problem.
All Lights OFF
indicates.
A. NO power through the main power switch. Check the
following:
a. Is main power switch (Fig.11) still turned on?
b. Are the circuit breakers (Fig. 16) still turned on?
c. Verify external power supply (120V) to inlet plug
(Fig. 7).
#1 Unit Power Light is ON
indicates.
A. Power is present through main switch. The 2 digital
temperature gauges should be ON. If not, use a multi-
meter to check the following:
a. The 2 transformers (Fig. 18) should show 120VAC
in and 6VDC out. If power goes in but not out, replace
transformer.
b. If there is 6VDC at the digital gauge but it does
not illuminate, replace the temp. gauge.
B. There is no power going through the low water cutoff
(LWCO) switch (Fig. 21).
a. Check fluid level in reservoir. Should be at least ¼
level. Add if necessary.
b. Check, with a multi-meter, for 120V in and out of
LWCO switch. If fluid is adequate and there is power in
but not out, replace the LWCO switch.
MAINTENANCE TASKS