Question about Dometic Rooftop RV Air Conditioner

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90 Privo has rooftop unit,does not try to start, unit looks like it has a step down transformer and a 6 pin relay box.Do I look a start cap I cannot find model # cover is gone

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  • Dometic Master
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I recently dianosed one of these and the problem was a open fuse in the fuse box. I by passed the relay box and ran the ac straight on an extension cord. Thats when I found out a fuse was blown.

Posted on Sep 11, 2009

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1 Answer

Noises from unit box


you posted in january remote indoor and outdoor sensors could try to activate relays

Jan 21, 2014 | Dometic Rooftop RV Air Conditioner

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I have a dometic penguin ac rooftop unit. Model no. 630215.421. Fan blows Compressor does not kick on. Fan blows just no cold air. If put on auto and go up or down in temperature On the thermostat The fan...


Bad run capacitor or bad compressor. If you hear an occasional click from the compressor try a new run cap and then a hard start kit. Otherwise it's more economical to purchase a new unit.

Sep 25, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

Relay board


sounds like when compressor starts it loading down voltage. replace capacitors.

Sep 16, 2013 | Dometic Rooftop RV Air Conditioner

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I have a LG LRE30453SW Electric Range and the relay pcb keeps going bad. I get an F7 error when starting the oven. The first time I noticed the black line in, from the power terminal, to the relay pcb was...


First, check the 220v line and breakers are properly grounded and that you are getting a constant 220v at the plug. Then you will need to check the transformer on the unit.To test a transformer you need to know what type of transformer it is first. There is a step up transformer which steps the voltage up and a step down transformer which steps the voltage down.
You will still test the transformers the same way for step up and step down transformers. If it is a step up transformer apply the incoming power to the transformer or plug it up. Now take your multimeter and place it on the AC volt scale and test the voltage if the voltage on the data plate says the transformer should step up to 220 volts and it doesn't then your transformer is bad.
Now repeat the same steps for a step down transformer. Plug up the incoming or primary power and test voltage on the outcoming or secondary side the voltage should step down to the proper value. If you don't read any voltage on the secondary or outgoing side then the transformer is bad.
To read the voltage place the two meter leads on the secondary side, or the side you will plug your equipment into. If the secondary side is an outlet then place the two meter leads into the top two slots in the plug and read voltage. You also want to make sure the incoming power is working as well. Otherwise you will be reading a bad reading every time.
If all that looks good, then you will need to replace the control board. Here is a link to the parts for your range.
Regards,Richard

Dec 08, 2011 | Ovens

1 Answer

A relay in my rooftop model 57915.33 chatters intermitently and trips the shore power breaker.


The reason the lights are not flickering and breaker not tripping when 6 pin harness disconnected that goes to roof unit is because the compressor and fan are disconnected, which would be the major draw that causes it. There is a few ways you can narrow down the cause, or defective relay, but my guess is if it's causing lights to flicker and breaker to trip, it's on the compressor circuit. The fan coming on and off unless capacitor faulty wouldn't draw it down that much, and obviously capacitor is good otherwise it wouldn't operate good when turned on normally. I'd start by inspecting wires to and from thermostat for possible rubbing or touching against one another at a bare spot perhaps. Can't rule out 100% that thermostat isn't defective as well. When thermostat set to cooler temperature, and on, does it turn off and on in normal cycles, to maintain temperature?

Nov 27, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

My 4WD dash lights are flashing and the 4WD won't engage. Also, my power windows and moonroof won't work. I've checked all of the fuses and they're good. What else should I check?


There's a TSB out for this concern. Its just a faulty relay

adobe.gif Printable View (8 KB) TSB
98-13-19
  • ELECTRICAL - LOSS OF 4X4 SYSTEM
  • LAMP - 4X4 LAMP ILLUMINATED
  • LAMP - NO INTERIOR LIGHTING
  • MOON ROOF - INTERMITTENT OR LOSS OF POWER
  • REAR WIPER - INTERMITTENT OR LOSS OF POWER
  • WINDOWS - INTERMITTENT OR LOSS OF POWER
Publication Date: JULY 6, 1998
LIGHT TRUCK: 1997-1998 EXPLORER, MOUNTAINEER
This TSB article is being republished in its entirety to correct the Service Procedure Steps. ISSUE: A flashing 4X4 lamp and/or a intermittent or loss of:
  • Power windows
  • Interior lights
  • Rear wiper (if equipped)
  • Moon roof (if equipped)
  • 4x4 system (if equipped)
may occur on some vehicles. This may be caused by an intermittent Battery Saver, Accessory Delay or One-Touch-Down Relay operation and possible chafing of vehicle wire harness.
ACTION: Repair the affected circuit, and/or replace the Battery Saver, Accessory Delay, or One-Touch-Down Relay. Refer to the following Diagnostic/Service Procedure for details before replacing any components.
DIAGNOSTIC/SERVICE PROCEDURE Accurately RECORD ALL Diagnostic Trouble Codes (DTCs) from the Generic Electronic Module (GEM). The following codes can be generated by a faulty relay:
  • B1371-Illuminated Entry Relay-Circuit
  • B1302-Accessory Delay Relay-Circuit
  • B1398-One-Touch-Down Relay-Circuit 1
  • B1814-Rear Wiper Motor Down Relay-Circuit
  • B1818-Rear Wiper Motor Up Relay-Circuit
  • P1820-Transfer Case L2H Relay-Circuit
  • P1824-Clutch Relay-Circuit
  • P1828-Transfer Case H2L Relay-Circuit
DIAGNOSIS
  1. If you have any of these codes B1371, B1814, B1818, and/or the interior lights or rear wipers are part of the customer concerns, go to Step 12. Otherwise locate the Accesory Delay Relay and proceed to next Step.
  2. Put key in "RUN."
    1. If conditions are repeatable, go to Step 3.
    2. If conditions are not repeatable, follow standard GEM troubleshooting procedures.
  3. Operate the windows until they fail then proceed to next Step.
  4. Remove relay from relay box then proceed to next Step.
  5. Check for battery voltage at Pin 87.
    1. If battery voltage is present, go to Step 6.
    2. If battery voltage is not present, go to Step 23.
  6. Check for battery voltage at Pin 86.
    1. If battery voltage is present, go to Step 8.
    2. If battery voltage is not present, go to Step 7.
  7. Locate the Battery Saver Relay and check Pin 3 for battery voltage.
    1. If battery voltage is present, go to Step 23.
    2. If battery voltage is not present, go to Step 16.
  8. Return the Accessory Delay Relay back to the relay box then proceed to next Step.
  9. Check for Ground at Pin 85.
    1. If Ground is present, go to Step 10.
    2. If Ground is not present, follow standard GEM troubleshooting procedures.
  10. Check for battery voltage at Pin 30.
    1. If battery voltage is present, follow normal GEM diagnostic procedures.
    2. If battery voltage is not present, go to Step 11.
  11. Check all female terminals at the relay.
    1. If all terminals are tight and all wiring crimps are good, REPLACE the Accessory Delay Relay, then go to Step 22.
    2. Make sure all terminals are tight and all wiring crimps are secure then go to Step 9.
  12. Locate the Battery Saver Relay.
  13. Put key in "RUN."
    1. If conditions are repeatable, go to Step 14.
    2. If conditions are not repeatable, follow standard GEM troubleshooting procedures.
  14. Operate the windows until they fail then proceed to next Step.
  15. Remove relay from relay box then proceed to next Step.
  16. Check for battery voltage at Pin 1.
    1. If battery voltage is present, go to Step 17.
    2. If battery voltage is not present, go to Step 23.
  17. Check for battery voltage at Pin 5.
    1. If battery voltage is present, go to Step 18.
    2. If battery voltage is not present, go to Step 23.
  18. Return the Battery Saver Relay back to the relay box then proceed to next Step.
  19. Check for Ground at Pin 2.
    1. If Ground is present, go to Step 20.
    2. If Ground is not present, follow standard GEM troubleshooting procedures.
  20. Check for battery voltage at Pin 3.
    1. If battery voltage is present, follow standard GEM troubleshooting procedures.
    2. If battery voltage is not present, go to Step 21.
  21. Check all female terminals at the relay.
    1. If all terminals are tight and all wiring crimps are good, REPLACE the Battery Saver Relay, then go to Step 22.
    2. Make sure all terminals are tight and all wiring crimps are secure then go to Step 19.
  22. Verify all concerns are corrected.
    1. If all concerns are corrected, return vehicle to customer.
    2. If all concerns are NOT corrected, go to Step 23.
  23. This is Not a GEM-related issue. Follow standard troubleshooting procedures.

PART NUMBER PART NAME F5TZ-14N089-B Relay - One-Touch-Down And Battery Saver FOAZ-14N089-A Relay - Accessory Delay F77Z-14B205-AA Generic Electronic Module (GEM) (1997 4X2) F77Z-14B205-BC Generic Electronic Module (GEM) (1997 4X4) F87Z-14B205-BA Generic Electronic Module (GEM) (1998 4X2) F87Z-14B205-CB Generic Electronic Module (GEM) (1998 4X4)
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 98-11-6
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME 981319A Perform Pinpoint Tests 1.0 Hr. 981319B Replace Relay 0.2 Hr.
DEALER CODING BASIC PART NO. CONDITION CODE 14B205, 14N089 42
OASIS CODES: 102000, 105000, 201100, 202000, 203200, 206000, 502000, 504000, 508000

Copyright © 1998 Ford Motor Company
2010&c18=modelyear&c21=98-13-19&c35=tsb%2c98-13-19&s=1366x768&c=32&j=1.3&v=y&k=y&bw=1329&bh=453&ct=lan&hp=n&[aqe]

Mar 10, 2011 | 1998 Ford Explorer

1 Answer

I have a 92 terry 29' camper. I accidently connected 240v to it. Funny, I Know.Now, the coleman ac/htpump does not work . Did I Ruin the unit or can it be repaired? Also the 12v capacitor is out


It's hard to say. You should probably start by checking your transformer. I don't think line voltage goes to the control board. If your transformer is OK then check out the other components (contactors or relays). Then check the windings on the fan motors and compressor motor. Give it a good visual inspection looking for anything that looks burnt and see if anything smells burnt. One question, did you turn it on or was it done before you got that far. If you didn't turn it on then maybe you'll just be looking at a transformer and you said the capacitor was out.

May 14, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Item Potential Relay Type Pro Pac


get solid state starting relay and 65Uf cap from any refrigeration parts shop or to test comp remove all wires and hot start it or email me your wireing plans and relay info p.hampton25@yahoo.com.au

Apr 23, 2010 | DeLonghi Trane 5t Rooftop Air Conditioner...

1 Answer

No 12 volt power to duo therm comfort control box


check if you have 240V and then 12V to the secondary of the transformer if none then its your transformer that is faulty

Aug 02, 2009 | Dometic Rooftop RV Air Conditioner

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