Reznor YDHA - Troubleshooting the Heat Section

Form O-Y, PN 273647R5, Page 46
352%/(0 352%$%/(&$86( REMEDY
Unit does
not operate
1. No power to unit 7XUQRQSRZHUFKHFNVXSSO\IXVHVRUPDLQFLUFXLWEUHDNHU
2. Blown fuses &KHFNDQGUHSODFHLIQHFHVVDU\
3. Defective or incorrect wiring. &KHFNZLULQJDQGFRQQHFWLRQV5HIHUWRZLULQJGLDJUDPSURYLGHGZLWK
unit.
4. Defective or burned out control
transformer
&KHFNVHFRQGDU\YROWDJHZLWKYROWPHWHU5HSODFHLIQHFHVVDU\
Fan
operates
but element
does not
heat
'LUW\¿OWHUV &KHFN¿OWHUVDQGFOHDQRUUHSODFHLIQHFHVVDU\
2. Defective air proving switch &KHFNDQGUHSODFHLIQHFHVVDU\
3. Blown element fuses &KHFNDQGUHSODFHHOHPHQWIXVHVLIQHFHVVDU\
,QVXI¿FLHQW
heat
1. Burned out element 1. Turn off power and check element resistance with ohmmeter. Replace
if open.
2. Blown fuses &KHFNDQGUHSODFHLIQHFHVVDU\
&\FOLQJRQOLPLWFRQWURO 3.
D&KHFNDLUWKURXJKSXWWHPSHUDWXUHULVH
E&KHFNPRWRUUSPDJDLQVWQDPHSODWHUDWLQJ5HSODFHPRWRULIVSHHGLV
too slow.
F'HIHFWLYHOLPLWFRQWURO&KHFNZLULQJDQGFRQQHFWLRQV&KHFNFRQWLQXLW\
through control and replace if necessary.
4. Defective or incorrect wiring. &KHFNZLULQJDQGFRQQHFWLRQV5HIHUWRZLULQJGLDJUDPSURYLGHGZLWK
unit.
7.3 Troubleshooting the Heat Section
7.3.1 General Troubleshooting - Electric Heat Section (Option E__)
LED State
Indicates Additional Information
Color CODE
All Solid Digital compressor
controller failure
The installed digital compressor controller can be tested
WRYHULI\WKDWLWLVZRUNLQJSURSHUO\,QHDFKWHVW9$&
PXVWEHVXSSOLHGWR9$&DQG&20)RURXWSXW
WHVW9$&PXVWEHVXSSOLHGWR/DQG/
Input Tests - 1) Thermistor Input - Disconnect thermistor
77/('VKRXOGGLVSOD\&RGHDQG2) Demand
Input'LVFRQQHFWXQLWFRQWUROOHU&&/('
VKRXOGGLVSOD\&RGHXQOHVVDSUHYLRXVDOHUWFRGHZDV
present.
Output Tests - &RQWDFWRU2XWSXW - while the controller
LVSRZHUHGRIIQRVXSSO\YROWDJHWR9$&DQG
&20GLVFRQQHFWVLJQDOZLUHIURP&&DGG
MXPSHUZLUHVIURP3WR&DQGIURP3WR&UHDSSO\
SRZHUWR9$&DQG&20,IIXQFWLRQLQJQRUPDOO\
same voltage should be read across M1 and M2 as
DFURVV/DQG/XQOHVVDQ/('$/(57FRGHLV
SUHVHQWDQG2) Unloader Output - while controller is
modulating the unloader solenoid (whenever the yellow
/('LVOLWYROWDJHDFURVV8DQG8VKRXOGEHWKH
VDPHDV/DQG/
All Flashing 9$&6XSSO\WRRORZIRU
operation
7.0 Troubleshooting (cont'd)
7.2 Troubleshooting Compressor Digital Controller (cont'd)