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Quest Oil Fired CHH-980 Installation, Operation and Maintenance Instructions
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7. Troubleshooting
7.1 Fault Determination
The CHH-980 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 should fail:
IMPORTANT: If all switches have been turned ON and the system was operating
correctly, 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.14) still turned on?
b. Are the circuit breakers (Fig. 19) still turned on?
c. Verify external power supply (120/240V) to inlet plug (Fig. 10).
#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. 21) 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. 24).
a. Check fluid level in reservoir. Should be at least 1/4 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.
c. With no power going to the burner limit circuit and the burner panel switch turned ON, the alarm
circuit of the LWCO should be energized (120V). This opens contacts in a relay that will prevent the
pumps from running with no fluid in the system.
#2 LWCO Light, (plus #1) are ON indicates.
A. LWCO switch (Fig. 24) is sensing sufficient glycol in the reservoir and power is going through the switch.
B. There is no power going through the high temperature limit switches (Fig. 25).
