Specifications

Right Wrong
Bubble
Correct
Wrong
051 - FAULTY FLAME RECOGNITION
1. Common cause is restarting of the heater after a failed start attempt.
i. Refer to Code 52 for no-start situations.
052 - NO START SAFETY TIME EXCEEDED
1. No ame detected on start attempt but unit diagnostics are unable to detect a fault.
050 - TOO MANY NO START ATTEMPTS - (LOCKOUT). 10 CONSECUTIVE CODE 52 CODES WILL RESULT IN AN ECU LOCKOUT SITUATION
This is normally not a warrantable failure
1. Document and clear fault codes
2. Restart troubleshooting
i. Reference code 52.
051 - FAULTY FLAME RECOGNITION
1. Common cause is restarting of the heater after a failed start attempt.
i. Refer to Code 52 for no-start situations.
052 - NO START SAFETY TIME EXCEEDED
1. No ame detected on start attempt but unit diagnostics are unable to detect a fault
2. Check exhaust and combustion piping for restriction (non-warranty).
a. Low spots.
b. Crushed or kinked piping or lines.
3. Inspect and or replace fuel lter on inlet side of fuel pump, see page 31 (maintenance).
4. Check fuel pump operation.
a. Pump should tick, if so continue to step 5 if not continue below.
b. Install test pump, clear codes and run unit.
You cannot probe the fuel pump plug for voltage - this sets a code 48 and prevents the unit from running.
c. If problem is resolved install pump, clear codes, run unit and restart troubles shooting.
Otherwise continue below.
d. Troubleshoot wiring from pump to harness (non-warranty).
e. If wiring is damaged repair as needed using heat shrink & solder butt connectors.
5. Check fuel supply/measure fuel quantity.
a. Disconnect the fuel line from heater.
b. Turn the unit on (remember 60 second delay prior to pump activation).
c. Place the fuel line into the graduated cylinder and allow to run through a rst start attempt.
d. Once fuel pump stops running from rst start attempt turn the unit off.
e. The measured fuel must be between 8.5 to 9.5 milliliters.
f. If the reading is high and the pump angle is veried correct, replace the pump, clear the codes, run the unit, and restart troubleshooting.
g. If the reading is low, inspect all fuel line connections to see if the lines have a crisp cut on the end (Figure 1). Inspect fuel pick-up pipe for any obstructions.
Figure 11
h. If no fault is found on the inlet line or pick-up pipe operate the fuel quantity test from an external fuel source.
i. If results are still low replace pump.
6. Replace atomizing screen, clean starting air / vent hole (maintenance) and inspect glow pin.
a. If pin visibly deteriorated replace it, clear codes and restart trouble-shooting.
7. Check ame sensor resistance, see page 19.
8. Remove and inspect the burner chamber (see pictures in Basic Repair Analysis).
a. If burner chamber has carbon build up replace the burner chamber.
1. Soft carbon: (non-warranty).
a. Is an indication of over-fueling (check FMP angle).
b. Restricted exhaust.
c. Restricted intake.
d. Plugged blower wheel.
2. Hard carbon: (non-warranty).
a. Is an indication of too much additives.
b. Heavy concentration of bio-fuel.
c. Short cycle of heater (recommended minimum runtime is 15 minutes).
d. Road debris (reposition combustion air intake so not to pick-up road debris).
b. Clear codes and run unit.
5
Fault Code / Troubleshooting
REVISION LEVEL A - 12/09/13
13
PLEASE NOTE!